It won't work in IL-2 1946 because the way it is going to be mapped is different between COD and IL-2.
I am not really sure what you want here. That skin is for COD, it is the authors property ('Shado') and no it won't work in IL-2 1946.
And it's not protected content, otherwise 1C would have encrypted the default skins and hidden them away in the SFS archives, they didn't provide a Void to skinners and as a result they use the skins in there and make templates.