Someone pointed out that all three different scenes in the original gifset (which didn't crosspost) are actually different animals, visibly so, which is hilarious.
Probably they're filming in several locations and they are just using a local horse each time.
And it just-- doesn't matter! Different horse, no problem!

This is a plotbunny though, now I have to write a Roach replacement. But I don't want to write a horse death so maybe I'll work around it.