Hi - sorry for the slow response - been out of town a couple of days.
Sure you can use LHD lights as donors. What latters is that you keep you RHD projectors as they have the converters to LHD and also correct left kerb dip function.
I'd keep you black rear part, lenses, loom, etc. and use the donor clear indicator lens, poly carb outer lens and scrap/keep for spares the rest