Not necessarily IMO. Cherokees only weigh about 3000lbs. I found where VX's top the scales around 3900lbs! WTF! Geez, how are they that heavy? Consider power-to-weight ratio (since the 4.0L is similar to the 3.5L in power) by looking at a weight difference of almost 1000lbs, it doesn't sound like a VX could "keep up". IOW, I bet a Jeep would run circles aroung a VX on the street. (Make sure you understand I'm not criticizing the VX here, just pointing out the obvious difference -- on paper).
More digging...I found a site that provided 0-60mph times. For whatever reason, the VX's are 1-2 seconds faster than Cherokees. Hmmmmm.....
I guess body shape (drag), and gearing might be better on the VX. Still doesn't seem right!