I’m not sure it ultimately makes any difference. My son’s scores were dead-even in terms of correlation between the ACT and SAT (he took both, which is what any Michigan kid does if they’re serious about applying to top programs beyond the state.). At his school, they also took the PSAT, which also correlated almost exactly with his future scores on the SAT and ACT.
That’s anecdotal of course, but I don’t see why it will make much difference. If I can correlate a score off a grid, I’m pretty sure any Michigan admission counselor can 
but maybe I’m missing something here.