Neatsfoot oil is a yellow oil rendered and purified from the shin bones and feet of cattle. Neatsfoot oil is used as a conditioning, softening and preservative agent for leather. Also, it is great for restoring bone and horn products.

Neem oil is a vegetable oil pressed from the fruits and seeds of neem (Azadirachta indica), an evergreen tree which is endemic to the Indian subcontinent. It is primarily used in the costmetic industry.

They are not interchangeable, and the one you need is the neatsfoot oil. I suppose "for Horsey use" would be fitting

Good luck!