They sound more close in WOFF because they are all authentic with the appropriate AC. Le Rhone 9j, Le Rhone 9c, Gnome Monousoupape, Gnome, Clerget, Oberursel UI, UII, UIII, Mercedes DIII, Mercedes DII, Mercedes DIV, Beardmore, Daimler, Hispano Suiza in different variants etc. etc. Internal and external. I know because I made them. But for the sake of modding, why not. Everybody can do as he pleases and what he likes.