Quite recently I needed to run a check on a SCOM 2007x version. Gladly I found a blog which is all about build numbers for a wide range of Microsoft Products.
On that blog there is also a page all about the build numbers for SCOM, starting at MOM 2000(!) up to SCOM 2012 R2 UR#5. This enabled me to pinpoint the exact version of SCOM 2007x and the CU level. Awesome!
So I’ve added this blog to my favorites: https://buildnumbers.wordpress.com/scom/.