I don't have a Slash 4x4 to measure things, but most likely the arms are shorter, and/or mounted inward farther. On a Slash 2wd (uses two different offsets of wheels front & back?) the front offset wheels are even more pronounced... 13mm difference from so-called SCTE/Tekno offset wheels.
Yes, tires rubbing on the body is my concern. Traxxas Slash 4x4 wheels are almost a 9mm difference from the recommended Tekno/SCTE "0" offset wheels. A person could probably get away with using +3 offset wheels to put Tekno SCT platforms at maximum width if they are in a racing environment and...