[fullmetal]

No, not between RB and WR.  But for overall roster strategy, it may make a big difference.  If you drafted Doug Martin or Jonathan Stewart, for example, you've been down a reliable scorer at RB for the whole season.  Being allowed to move TyMont to RB could let you fill that hole and plug in another hot WR. 

You can generally find more hot WRs on the waiver wire through the season than RBs.  There are just more WRs than RBs, and that scarcity makes RB the traditional first pick of any manager's draft strategy if they have a high enough pick.  (This can sometimes fail spectacularly if your first round draft pick is injured...ahem, Adrian Peterson.  Or Arian Foster if you were so inclined.)

[fullmetal]

No, not between RB and WR.  But for overall roster strategy, it may make a big difference.  If you drafted Doug Martin or Jonathan Stewart, for example, you've been down a reliable scorer at RB for the whole season.  Being allowed to move TyMont to RB could let you fill that hole and plug in another hot WR. 

You can generally find more hot WRs on the waiver wire through the season than RBs.  There are just more WRs than RBs, and that scarcity makes RB the traditional first pick of any manager's draft strategy if they have a high enough pick.  (This can sometimes fail spectacularly if your first round draft pick is injured...ahem, Adrian Peterson.  Or Arian Foster if you were so inclined.)