Looks like bone or horn on top and plastic on the bottom razor.
Could be wrong, and the top could be french ivory, an earlier version of plastic.
Hard to tell from the pics, but there doesn't appear to be any grain whatsoever to indicate ivory, and the color doesn't seem right for ivory on either.
It is hard to tell from photographs, but the top one appears to have striations. Also, there are areas that are turning pink. This might suggest that the top razor could be either ivory or horn, but not likely bone.
I'm gonna say plastic. If you take a knife or razor blade and pick an inconspicuos place to shave some material and it curls its definately not ivory or bone.