I noticed a difference in the meat color of my chickens vs store bought-- I have only seen my rabbit meat, so don't know anyting other than "wild" is dark, and 'domestic is white' In birds, yes, meat is cpolored diofferently based on the muscle use-- the 'fast' muscle is white, while the slowe muscle is dark--(go figure- breast meat is 'fast') it has to do with the rate at which energy gets used by the muscle fibers as they work, I beleive.
meat wil be flavored by sucvh things as nuts-- deer eat the WHOLE acorn-- shell and all. The shells contain high levels of tannic acids- squirrels, do not eat teh shells. So, eys, dear feeding on a heavy mast crop will very likely taste quite differently than those feeding on the neighbors sweet corn. I do know, that straight grass fed beef is not as sweet tasting as beef that has been finished with corn..