I have this problem now. I have a newly acquired Australian SMLE. It's actually a J. Jovino Co. parts gun, made up of surplus SMLE parts, and therefore has no collector value. But it will give me, for shooting purposes if not collecting ones, a mint, unissued condition No. 1 Mk. III* with a nice, shiny, completely unpitted bore -- the very thing I've always wanted. (I just have to make sure those internal copper recoil plates are in the stock; I've read J. J. Co. usually left them out, and the softer coachwood stocks will eventually split if the gun is fired without them.)
Problem is that the rifle came with one of the short length buttstocks installed. It's too short for me. So I managed to obtain a standard length, NOS Australian coachwood replacement buttstock (marked SLAZ 42 and everything), which arrived totally unfinished, and is much lighter than the wood that's already on the gun (which isn't very dark itself). I don't know if the slightly darker wood that's on the gun has been treated with linseed oil only, or whether it did get some additional finish or stain. I've got to figure a way to match the buttstock reasonably closely.