After looking at pics of Mochas, I suppose it could be. Mocha's look pretty normal to me. If you bought it from a reputable breeder, I would trust that it's a Mocha until proven otherwise. If you got it on Craigslist, I would be sceptical...
Lucifer Sam, Siam cat...
Always sitting by your side,
Always by your side...
That cat's something I can't explain...