No...really?! Obviously a machine set to pay out 98% of what goes in it will pay out a lot more than a machine set to pay out 78%. So it would have to be less tight! Hell, even Vivids would play well on 98/99%!!
I know I was stating the obvious but I was kind of trying to answer the OP's question of whether there was a difference between using a percentage key or simply removing it and using the dips on the MPU.
