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Ooops.Another difference:
The folks that formed the PCA in 1972 got to keep that name without threat of lawsuit.
The OPC was originally called the PCA when it formed but was sued by the PCUSA over the name and had to change its name to the OPC.
I'll be honest with you, I think the name of the OPC is a hinderance to its broader appeal and it might have grown more rapidly in recent years if it didn't have the name.
I was not a complete novice to Reformed theology when I moved to CA in 1999. I was concerned because there was only an OPC in town and I had just become Presbyterian (in a Springfield PCA congregation) a couple of years prior. It had been quite a leap for me and my wife to leave "interesting" worship for the sake of sound doctrine in a PCA Church.
I didn't know anything about the OPC except it's name. The term Orthodox in its name instills the idea of being old, stodgy, etc. I pictured all the men in suits and all the women in bonnets singing with dour expressions.
I know that sounds funny to some now but I think I can safely say that, at the time, I represented what a typical evangelical in the process of reforming is thinking. My vocabulary has always been above-average so imagine what others are thinking.
I don't know the solution because I love the OPC. There's no point in going back in time but I sometimes wonder how the OPC might have grown with a different name.
Since being reformed, I have actually always thought to myself that the OPC had a better name than the rest of the Presbyterian Churches.
Are you looking more for what the differences are in faith/practice between OPC and PCA? Assuming "yes".... I know the PCA encourages infant baptism and such children receiving the Lord's Supper at an early age. I believe the OPC encourages infant baptism, but withholds the Lord's Supper until the child is older (teen-agish, right?).
Interesting. Do you think any of the leadership might consider changing the name?I've actually been wracking my brain for a fair way to characterize the differences but each time I come up with an idea I realize I could come up with an OPC or PCA that I know of that "breaks the rule" I'm thinking about. This is tough.
In broad categories, on the whole the OPC is a bit more conservative. The PCA is likely to have large congregations that are not strictly Reformed with people who are Presbyterian in the South because they've always been Presbyterian.
OPC congregations are typically pretty small. The OPC is about 1/10th the size of the PCA.
Maybe a good characterization is that being in the OPC is like being in a small town as opposed to a city - more likely to know your neighbors but also likely to be sometimes wary of strangers. The city dwellers may be too busy to get to know each other and too big for the leaders to keep good tabs on the goings on.
Again, these are broad brush strokes.
PCA, formed 1972 by faithful ministers (and their congregations) who voluntarily left the southern Presbyterian mainline (PC,US--formerly PC, CSA)
The folks that formed the PCA in 1972 got to keep that name without threat of lawsuit.
Actually the National Presbyterian Church was formed in 1973 by faithful ministers (and their congregations) who voluntarily left the southern Presbyterian mainline. There was a "Convocation of Sessions" in the summer of 1973 that established the "Organizing Committee of 40" and the first General Assembly was in December of 1973.
The 1974 General Assembly a received a communications from the National Presbyterian Church, a congregation of the northern church in Washington DC. After a short discussion a new name, Presbyterian Church in America was adopted.
See A BRIEF HISTORY PRESBYTERIAN CHURCH IN AMERICA
If they both hold to the same confessions why don't they join forces?
If they both hold to the same confessions why don't they join forces?
If they both hold to the same confessions why don't they join forces?

If they both hold to the same confessions why don't they join forces?
The Dutch Reformed DON'T fit in. Hahahahahahahahahahahahahahaha!
(Sorry)
The proposed mergers went:
PCA proposes "joining & receiving" (J&R) to both the OPC and the RPCES within a few months/years of forming (yes, the PCA had an immediate name change, just like the OPC).
Both smaller bodies voted to join the larger, which involved no negotiations of merging documents, etc. The churches were simply to adopt the PCA's documents and structure (the West. Stds. being basic to all).
The PCA voted to receive the RPCES, and rejected the OPC. This was blamed on the then-current Shepherd controversy at Westminster.
At a later date, the PCA revived the J&R process, and re-invited the OPC. However, at this point the OPC desired a true merger of churches, not a "falling in" with the PCA. However, the form and terms of union was not negotiable according to the PCA. So the second time, the OPC was the side that demurred.
Interestingly, while it seems true that the RPCES pulled the PCA in a decidedly "evangelical" direction, prior to the NPC/PCA formation (1973, my mistake above) the OPC and RPCES had for a number of years been in merger discussions, but they were not moving very quickly. The RPCES was itself a union of two bodies, one of which was the largest BPC synod now separate from Carl MacIntire. So, there was some impetus for a few years to repair the breach he precipitated with the OPC at its birth.