I don't think a mix and match policy on any car will affect it's value. Unless it's a Ford/Vauxhall/Toyota door handle etc. obviously. Something that's difficult to remove and install the correct bit.

Price is what the buyer is willing to pay and the fact that this is a LHD car in a market where registration may be an issue/difficult or where export to another country is simplified by prior registration will increase it's value. I don't know specifics with Norway though! Then there's the lack of cars on the market at any given time and the long waiting time for the order books to reopen at LB Cars all of which will contrive to drive prices higher.

Good luck with the sale Magnar! Hope you get what you want for the car and the new owner makes themselves known to us all!

Guy