You can line them up and compare, they line up very well:
Tatum ---> Shai G-A
Brown ---> Jalen Williams
Porzingis ---> Chet Holmgren
White ---> Lugu. Dort
Holiday ---> Cason Wallace
Horford ---> Hartenstein
Pritchard ---> Isaiah Joe
Hauser ---> Aaron Wiggins
I think the Celtics win 1-8 as of right now. Over time, OKC has a clear #1 but who is the clear #2 and #3? Williams and Holmgren? To me, that is the key going forward. They need to establish the #2 and #3, then they can use the draft picks to put good players around them at a reasonable cost.
Both teams are guard heavy right now, but at least we have Tatum, a true natural forward. Their most used line up is SGA/Williams/Dort/Wallace with Holmgren when he is back (with Hartenstein in the meantime). That is 4 guards and a 7-footer. It is working for them so far it seems, but I see that as problematic.