Hi,
Squirrels vary greatly in size, depending on not only the type of squirrel, but also the region in which they live can effect the size to which they grow and the density of the fur. Gray squirrels tend to be larger than the red type of squirrel. I do not know where you live, but the squirrels I grew up with got pretty darn large. From the photo, your pelts look about right for squirrel, to me.
Beaver is much denser.
When I wore vintage furs, back in the 70s, I loved squirrel coats as the fur was so very soft. It does not wear well over time and lost favor but I still think it is a lovely fur. Very popular for a long time, not much now.