Suspension kit is just that- everythying dealing with suspension- A-Arms, T-bars, Shackles or AALs, shocks usually, sometimes a diff-drop. Stuff like that.

Body lift kit is pretty much just rubber/poly pucks that replace the body mounts on the frame, and it raises the body only. Comes with bolts, instructions and a few other parts.

Suspension kit- $$$$
Body Kit- $$