Large one appears to be for a man's shoes and smaller one for a woman's.

Large one has 52 T impressed on back and small one has 52 U on back.

Large (men's) measures 4 1/4" in length by 4" across. 

Small (women's) measures 3 1/2" in length by 3 1/4" across.

Molds have 3 holes in bottom - see pictures.