1. If you have the Cmmods Pack you are done.
2. The main difference between mods is the coloring of the BMPS, Vein´s being greener, more vivid than my version, mine being more sepia-brownish. Another difference is the main ground(grass) BMPS, I will post two pics for you to see the difference:
Aris Version: (based on Bil Hardenberger´s mod with grid removed and sepia tinted):
Vein´s Desaturated Version:
As always, it´s just a matter of what looks nicer for you once in the game. I use my mod, because I did it for myself, but many many people use Vein´s because is beautifully desaturated. Decisions...