Goebel W. Germany Ceramic Kittens

This pair must be from the same litter, and they are playing? Both are about 4-1/2" long and one is 3-1/2" tall, the other 2-1/2". Their numbers are 31 020 06 for the one, and just an 02 in the foot of the other. Both are marked Goebel W. Germany. Made in the 1980's.