Shep for Williams? Ppr keeper league

Owner of J.williams (den rb - 5th round) indicated they would trade him for S. Shepard (15th round) Full ppr keeper league. Do you think its a fair trade?

My rbs are: monty, jk dobbins, sermon, elijah Mitchell, pollard, ronald jones. TRASH

My Wrs are: ridley, dk, corey davis, robby Anderson, rondale moore, elijah Moore.

Positions:
Qb
3 wr
2 rb
Te
Wr/te
Wr/rb