https://www.youtube.com/watch?v=_fvWYzokEcw
this should help you! :)
- O R -
Gonna write up an example but you can use whatever you see fit.
Open up Feralheart > my presets > preset_1 > [open up an art program by now] drag the preset_1head in > Color it > Save it > Save another copy > Re-name copy preset_2headL or even preset_2headR whichever you want
Open Materials file > Change
Same goes for the body.