Mihailo would have to prove yet that he matches that.
To me the obvious upgrades are:
(1) Boskovic is a natural 4.
(2) Much stronger upper body, but his legs are at least as heavy as Noah's as well.
(3) Proportionally longer (longer arms).
(4) Aggressiveness.
(5) Play at the rim. I wouldn't say Mihailo plays "above the rim" at a Big 12 level of play, but he's at least close.
(6) As a shooter, Mihailo's looking like he's probably gonna be comparable to Noah, but as an overall scorer he clearly gives us an edge this season.