The horse on the left is 30 64 7010, introduced in 1994 in set 3806 - one of the Western Fort sets - there's a cavalry mark on the back lower corner of the blanket.
The other horse is an early one form the 1970s. Not much is known definitely about these except that they came in some early boxed sets. In the US they were made by Schaper. They are known in light and dark brown plus white.
All the known Playmobil horses can be found on
This Page at Animobil.info