In properly improper terms, red squirrel and pine are the same. There is one other, the Douglas squirrel, on the west coast from BC to at least central CA, maybe farther, that is also a pine squirrel. They are the only two in the Genus IIRC and hard to tell apart. When I was in college many moons ago they had a few more species broken out, but they have been reassembled into two.