Owing to how livestock are commonly castrated young, no, not really lol. The only difference between the two is that most people only see one of those animals as pets.
if someone were to geld a horse like they do for cows,sheep and goats that would be listed in the book of dumb ways to die or people who died from being a pure idiot and
We can't really know what it feels like for them - I would say if you wouldn't want someone to do it to you without pain relief, animals should be given that mercy too.
I'd looove to buy an embryo to a WWW silver TB mare...I've seen quite a few floating around lately. PM me if you're interested in selling an embryo! Price not an issue and would be used with top WB stallion