Cows and Buffalo are both in the subfamily Bovinae. Croconaw is a Crocodile, but Feraligatr is an Alligator (not just by name, their teeth differ). If anyone can tell me the similarity between Froslass and Snorunt, and a few other families then they can have a cookie.
Fine. Croconaw/Feraligatr puts up a good point, but they actually look similar as well though.
They both are the same blue color, same style/color dorsal fins, same jaw, even the eye style is the same.
But Buffuron and Tauros, there's quite a difference.
The horns can easily be seen that they're not the same. Buffuron's horns seem to have a natural bone color, and they have rings, while Tauros' horns appear to be made of metal and doesn't have rings at all. I could be picky and talk about the way how horn is protruding from it's head, but I'll let that be.
Buffuron is hairy, and I'm not just saying that because of it's afro either. Look at it's body, it has a second layer of hair; a key trait of a Buffulo. Tauros, well, it isn't any normal bull but the only part from it that is hairy is it's mane.
Buffuron doesn't have a tail at all, or at least, it has that little stub, but Tauros has
3 tails. What was a key description to Tauros was how it used its tails to help it fight harder, actually to enrage itself. Something like that wouldn't suddenly just get dropped, XD.
The Mouth: meh, it's something, but you can see that Buffuron's lining for it's mouth goes over it's nose, including it and it's a grey color. Tauro's lining is only for it's nose and it is brown.
Minor detail:
Buffuron
-Yellow eyes
-stripe down eye along it's face
Tauros
-White eyes
-has studs on it's head