New carbs??..

I wouldn’t count on that.

I had two manual choke 750’s.
One Carter, one Ede.
They came from the factory with the same jets and metering rods ootb.

However, the air bleed and feed restrictions in the clusters weren’t at all the same.

And when dyno tested back to back on the same motor, did not exhibit the same performance characteristics at all(the Carter calibration was just better).

As for jpars situation...... go on eBay and buy a used carb to match one or the other of what you have.
If you get a Carter, make sure it’s the same part number as what you have now, since there are a lot of variations of the 625.
For whatever reason maybe it's just having these for so long now and when I did Progressive used the Carter as my primary but it did seem like the Carter performs a little better... and that's just me spitballing and guessing of course but a feeling I get for sure.. again the idea of matching the 1406 is more parts availability and easy documentation to look up...