IFAIK they were all much of a muchness for size
Three feet longer is 10%... that's not really a muchness...
I believe the longer engine, mounted further forward, angled slightly downwards and with a lower thrust line mean the Griffons have less prop tip clearance (with slightly shorter blades than the MkIX), so a rough or soft grass runway might be less forgiving than it would for a Merlin aircraft.