Mayaman, I think they say this to cover their butts because this isn't an apples to apples swap. They don't want you trying to send the motor back if you try installing it into a Limited and it won’t start without changing the wiring harness, and what ever else that is different and needs to be changed.
I believe their inventory programs are very "gender specific" and basically only tell them what the part came out of, and that's the only vehicle they know it will fit.