BTC0 is yours and mine..
CMBA0 isn't a catch code, CMBA0 is the "STRATEGY" that the BTC0 catch code uses.
CMBA0 goes with btc0 (last digit is always a number)
CMBA1 is the MXL3 catch codes strategy if I remember correctly.
I have an xcal with a CMBA1 strategy from dennis reinhart, and I flashed it over my CMBA0 strategy and it ran just fine.
I used this for testing, and comparison to my custom tune.
I drove the reinhart tune for about a week before flashing back to my custom tune. I like MINE better, but that is a personal preference more than an actual comparison.