I think there may be a difference between them in rebounding. Totals are obviously higher for Cluff, but looking at advanced stats, and rebounding % :
Cluff at SDSU led D1 in defensive rebounding at 32% and was 25% total.
Buchanan was 20% and 15%
For reference, Ejim was 27% and 20% his junior season. And Oscar Tshiebwe at Kentucky was 29% and 24%, and lead the nation in total% his Jr year.
I'll be very interested to see how all of Cluff's numbers translate to high level D1, no matter where he ends up.