SAT vs ACT

I have NEVER heard of the correlation changing based on the college. So Columbia and Princeton for arguments sake view a 35 correlated to a 2350 differently? What do you base this on?

I thought the correlation was done by the College Board and by ACT. Then a bunch of places try to do it but it is meaningless.

So at one school it is better to have a 35 and at another it is better to have a 2350? That seems odd. If that is the case then colleges do not treat the SAT and ACT the same, which is what I said to begin with. Is there anyone that values the ACT more than the SAT