Not as far as I know, at least not online.
They cannot be compared, apart from saying that they are all online games to do with horses.
Howrse is pretty similar. There is also Horse Isle 2, Legend of the Esroh
A Virtual Horse AVH
Answer One: There are many horse SIM games including Howrse, HorseIsle, the new Horseland, and some of the smaller sites. Answer Two: Horse Phenomena is just like the old Horseland.
Many people like to play Howrse because it is a management game. You must build a strategy in order to become successful. Overall the rewards are very large. I cannot comment on Horseisle except to say that it is interactive rather than static.
Some people like Horseisle
There are other horse sim and animal sim games. Such as Howrse Horseland fishLand Webkinz ect
Howrse, but you dont download it.
There is Babydow and Dragow (only in French).
There are some like Horseland and Howrse. I've included the links in related links.
Indeed, there are many horse games online. For example there is:Horseisle (Good Game, Ages 7-99, Free/ $)Horseisle 2 (Exactly like the above in info, but for 12+)Howrse (Free/$)MyStable(Mystable.co.uk)HorselandBella Sara
Neopets,Howrse,and Foopets