Well Melo is a better shooter

But can also bully guy in the post. A younger Melo was also someone who played often in the interior but became more of a 3pt-long 2-midrange guy in NY.
Mash also wasn't the most efficient guy as well, his most efficient seasons came in Miami when he was the 2nd/3rd option behind Zo and/or Tim Bug.
I don't think Mash would do damage on the boards but as a stretch 4 in this league, he could eat. But he'd get eaten on D as I never remember him being potent on that side.
I think the Melo comparison is better than Millsap