If I remember correctly, each version of the Community Mod was updated to the latest revision of FPSC at the time of release. The source code for v0.07 states that it was based on revision 767, which I believe is one of the 1.20 betas.
The "FPS-Files" edition of the community mod was based on the last 1.20 beta I believe. I cannot remember for sure though, it's been a very long time since I touched those sources.
Quote: "I would recommend the latest stable beta of the Community Mod, the one which was not made on the 1.19 source code."
Honestly, the testing release would probably be the better option to go for. It's essentially a release candidate in its current state.