Probably. Why wouldn't they look the same? If the animal is suited to its environment, it will persevere. If it produces some mutation which branches off and is also well-suited to its environment, the mutant line will, perhaps, develop into a different (but clearly related) species. And the parent stock will also continue to exist, unless some calamity wipes it out. This is how evolution works. I'm really not following your question at all. Are you operating on some notion that every species MUST morph into something different every 247.5 years?
No, I'm operating on the notion that if evolution is an ongoing process, then changes should take place. We humans have changed since then, right? But then, maybe I'm forgetting the fact that if all niches are filled, the evolutionary process will slow down or even stop. Hmmmm, I don't know, maybe there were mutated ancestors even then, humans just didn't elect to draw them....
Different circumstances call for a different approach, in order to survive.
My understanding is that all of the 17 or so lines of human-like creatures (for lack of a better term) that arose are evolutionary developments as a result of the east side story......