No, absolutely not. The seat has to be matched to the new valve, seat width must be correct and seating area must be correct on the valve seating area.Still getting nowhere posting pics, lol.
I took the head to a shop today and the machinist pulled out the bad valve. The valve of course is toast but the seat looks ok. He said I might be able to get away with just replacing the valve, cleaning and checking/surfacing the head. He didn't have tools small enough to cut the valves and the seats, but I don't think I need to do that if a new valve will seal in that old seat.
Get it done right.