I'd like to, but I can't see HTC allowing an La-5 skin to be substituted onto the La-5FN because the rear fuselage is a completely different shape. I've asked them about this recently WRT to allowing B-25G skins on the B-25H. The La-5F skin I just finished is basically the same shape as the La-5FN, just a slightly different airscoop, so I'm hoping they'll let that go.
I've looked for a photo of an La-5FN or La-5F in winter camo, but the only one I can find is of an aircraft used for wind tunnel testing.