I would say buy from ebay - prices or loose transformers has dropped over the last 3-4 months by quite a bit. After ROTF a single dino was going for around $80-$90 even over $100 now around $60-$70 can get you a good loose complete one. Exception is swoop he always goes for a bit more as his alot more prone to breakage.

If you do find one and your not sure ask the seller or ask for help on here with the auction link in the ebay or KO threads.

I dont have any pics on this pc im using now but I have comparison pics of all the KO's dinos and there are very slight differences in odd places. For example one of the lines in grimlocks mouth is a different!