They're almost 3 now. When I picked them up they had different names (Miley and Twilight) but nobody knew which was which so I figured different names were in order.
Mochi's eyes are more green and Boba's are more yellow. Boba's ears stick out to the side more and Mochi's stick straight up. Boba's head/nose is longer and Mochi's head is rounder. My app won't let me upload pics in comments, I'll try and upload a more recent pic when I get home.