You will have 3 different reactions. The extent of those reactions will be in the line, hand but you will not have one that'll be big arc and one that'll be hard backend etc.
The percentage of cover might or might not be 70-80% but there will be a difference. Earlier/later will be the most a person will see. A huge change in arc vs snap backend, I don't think so, never seen it myself on balls that were laid out the same and different cover grits, just earlier/later but very similar rolls.
Just what I have seen, but, never had any say 360 vs 1000 vs 4000 either.
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az guy aka: R & L Bowlers Pro
rlbowlerspro@cox.net
www.rlbowlerspro.com