so if 90 is more than 89 than we can assume there is a difference in the two numbers and after we carry the 12 and drop the 8 we can divide by planks constant which gives us the answer of 25:5:19 which in sig figs is YES.
But actually you might need to just tweak them a little bit. but you shouldn't need a bigger brake size.
i put 115mm brakes on 120mm skis. Didn't take the bindings apart (fks), just tweaked them a little and shaved of some of the black plastic on the brakes.
If I were you, I'd go with brakes that are 5mm or more wider than the waist of your skis. I have 90mm brakes on K2 Disorderlys with an 85mm waist, and they're very close. Just my $.02
I don't have a lot of experience, but I noticed on mine I had very little clearance even with 5mm. Like I said, it was just my two cents on the issue. I can take a picture and post it here if you want to see.