The frames are the same but aft of the doors the body mounts are different. It should be as easy as removing the mounts from the panel frame and transplanting them to the pickup frame as red58 says.
An AD truck does not have any extentions for the rear bumper, but the valance and bumper are panel specific, so make sure you get them and all the mounts.
I have not done this, but I have studied both frames a bit. If you have an assembly manual you'll see both the similarities and the differences very clearly.
