I don't see either of these players being in the long term plans for the C's. White is 32 and hitting the back side of his career.
Jaylen wants to be the man, but is not as well suited to be the man for the c's because Tatum has always been the better player.
So say you can move D white for a guy like Aaron Gordon(maybe someone less injury prone)
Then you move Brown for either sengun and wing or Giannis
Your core becomes
Pp
Hugo
Jabari smith
Tatum
Sengun
Plus whatever you get for white. (Aaron Gordon level player)
With a lot more cap flexibility
Or
Pp
Hugo
Scheierman
Tatum
Giannis
Queta
I think in a Houston trade you might have to include Queta to get back Parker or Reed.
Build it around Tatum, you'll never get more value in a trade for Brown than now. White is reaching the backside .