You're saying that those teams would have a .3PPP advantage over those 10 possessions?
no, i'm referring more to the cumulative effect of the way the game would have to be played. it's not just those theoretical 10 extra possessions, it's
all possessions, over the entirety of the game. a team like northern iowa, which plays a very specific, very deliberate style, would undoubtedly be less efficient if forced to play a more up-tempo game. their average possession length is 21 seconds per possession. using a 24-second clock, they'd be shooting against the horn on nearly every possession. i'm sure they can make some adjustments, but the end result would likely be a less efficient offense.
of course, you could also argue they'd be less efficient defensively. their slow pace forces opponents to exert lots of energy on defense, which makes them more tired offensively, and when teams are shooting poorly against UNI, it's hard to get into a rhythm when shot attempts are always 40 to 50 seconds apart.
my 3-point difference on spread in the hypothetical kentucky-UNI game is honestly probably too low.