That depends how different they are. Don't you think that "unmistakable" breeds of dog developed during the last 100 years?
Ooooh, *that's* gonna leave a mark...
But I doubt it'll have any lasting effect. I'm always amazed at how oblivious creationists can be to how badly their arguments have been body-slammed. Or even the few times when they realize it, they never generalize from "I was a complete idiot on that point and overlooked incredibly elementary things" to "hmm, maybe I'm not as competent on this topic as I had believed". No, instead it's, "but by gosh all the *rest* of my preconceptions are still 100% more reliable than those of a career research biologist!"
Rinse, repeat.