i just had newe monroes put on my 2wd at sears, and they shipped the 4wd shock for the front, and they wouldn't fit. they had to have someone go to the warehouse and get the correct shocks.. supposedly their computer database was wrong..., so, based of that, i would say they are different..
When I got my Trac, I took the OE shocks off, but ket them. When my brother got his 1999 Explorer 4x4, I gave him my OE shocks. They fit like a glove. When the Edelbrock shocks wore out, I sent them back for replacements. When we got them back, we put them on my bropthers 4x4 Explorer. Again, they fit like a glove.
The fitment may be the same, BUT if monroe uses different valving for the 2wd and 4wd then they are different... I would not put their 2wd shocks in my 4wd...
I just had Monroe Reflex shocks installed on my 2003 Sport Trac yesterday. The Monroe catalog listed different front shock numbers between the 4X4, and the 4X2 that I have.
The part numbers for my 4X2 are:
Front: 911177
Rear: 911035
I asked why there was a difference and he indicated that 4X4's use different valving than the 4X2 even if they have identical mountings.