The two tan ones are part of the party pony line by Lanard. There were three babies (you have two of the three) and three adults in that set which is the palomino family. The babies you have were sold individually on card while the pinto family babies were sold in a set of three, and the pastel family were sold as a mother/baby duo. I’m not sure on the adults for the palomino family, I’ve not seen one carded I don’t think. The pinto adults I know I’ve never seen loose or carded.
There are also another set or party ponies that were sold as a mother/baby duo and three baby set, I’m not sure what they were called other than party ponies, and they seem to have been sold in Europe. I know there’s a pink set with a baby and mommy with stars for a symbol.
Hope this info helps! If you google Lanard party ponies, you can see lots of them carded in the image search!
*edited to add* after digging through google image search it seems like the pinto family ponies were sold as a mommy/baby duo as well as the three babies together! I know I bought the babies together in the early 90s new in store, and could never find the adults!