No, the skid plate and how it mounts to the frame are different on the later frames. You can either add new rivnuts to your new frame to mount your old skid plate to it (what I did) or use the newer style skid plate (I think other parts may be required to do this, like maybe the trans mount may be different) or another possibility is to buy a aftermarket skid plate for the later frame (for more ground clearance)I have a question for you, in reference to your post # 16 where you mention relocating skid plate/ trany mount bolts. Does that mean the bolt locations are different on an '06 frame?
I'm doing the same year frame swap on a '98 TJ. I thought the only difference was the steering box mounting holes.