Now that this post is nearly two years old i guess it's a good time to answer the question. Yes, they can change colors, that doesn't mean that they will be completely different colors as they get older, or that they will be guaranteed to change colors. I've had several that i have gotten as neonates and they have started out a little red or green and darkened to a dark green (nearly brown) and a dark red (nearly brown). Now, i should say that they were all 100% poss het albino, which may be part of the reasoning why they were born red-ish, but not necessarily the true reasoning why.
Easterns commonly darken their colors. They also have many more color varieties than a western or plains hog. There are different colors such as red, green, brown, 'golden' (light brown), sand, and a few others. Just like humans, as we grow our color can change a little, so can theirs. The only difference is we do it on purpose sometimes.
Anyway, hope that answers the question, any one elses expertise would be greatly appreciated too.
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