Whilst agreeing with the adage that Enfields were made to be used in battle, with all of the ramifications that spring therefrom, the OP asked us a question. I'm not a Long Branch expert, far from it, but from what I've seen your rifle would have been stocked up either in walnut or birch. The birch tends to have a characteristic 'orangey-brown' colour, whereas the walnut is.........well, walnut colour. I do therefore wonder if you have a rifle with a mix of both woods on it. If the forend is a good fit & mated to the rifle then it would make much more sense, (as I think you already realise) if you really want to swap wood over, to swap the butt (& hand guards, if necessary). However, I'd keep the wood it came with so you can always reverse any changes you make.....
Sorry, not sure about the butt plate material. Long Branch used a lot made out of steel, but I'm not sure when exactly they started this.