One really has to have the pistols in hand to make the ramrods. The holes in the stocks might be to different depths, etc. You would also need to look really carefully at the one rod to decide if it was original. Dave is correct that on English pistol pairs one rod frequently has a worm on it while the other has a metal ferrule which is threaded internally. One would also want to do some serious research on American made pistols of that period regarding the wood to use. English pistols typically had a dark tropical wood like rosewood, but rosewood was only sparingly used in the early US for any purpose. There are probably some Booth pistols in collections, some of which have original rods. Your pistols are so nice that one really wants it to be done correctly.
Tom