If you could check the spring pressure at the shorter installed height it would be nice. But I have seen valve spring checkers that were way off calibration. I ended up buying a calibration spring just for that purpose.
The relatively low spring pressure probably wont be that much higher at the reduced height, and the springs will loose some pressure rating with time, so you could be A-OK.
IF you could measure each spring, then you could match weak springs with shorter installed height to help load them a little more. Then the installed seat pressure could be close to the same for all the valves. JMO