Probably leave the maple on the 10mm and put the walnut on the .44Spl.
That was my only complaint about the factory walnut Ropers, aside from the plainest wood known to man, they're a little too narrow at the top.The profile and swell on them looks like they would feel fantastic. I took my altoamont "roper" grips off my GP because they tapered too much from bottom to top causing the gun to sink in your hand under recoil. Those grips of yours looks like they would keep that puppy anchored where it should be. Again, very nice!