Evaluate this trade. 12 team PPR.

Been offered:
RB L. Bell
WR A. Jeffery

for

RB S. Ridley
WR AJ Green


My current roster is:
QB: Cutler, Ryan
RB: Charles, Woodhead, Ridley
WR: Green, Blackmon, Gordon
TE: Davis, Eifert
DST: Bears, Rams
K: Crosby, Bironas

I'm inclined to sit tight, but just wondering if there were other opinions out there.