Quoting melindapple:" no identical twins don't always look identical and one set could pull more genes from the mother while ... [snip!] ... from the mother while the other could pull more from the father. I mean it COULD probably happen, but I think it's unlikely."
OP, I've actually never thought about this. lol
I myself have identical twin boys who are 12. They look NOTHING alike, never have. They were born at 35 weeks due to TTTS and where just over two pounds difference. And for years have stayed 20 pounds apart. One has ASD and an SPD so he went years with out eating a very good variety, but has been gaining nicely these days