Sadly they dont
Edit:, just saw your other reply.
Yes the Expo mounting system is identical, 2wd front ends are the same as 4wd the difference between the cars was the rear axle setup.
The shocks themselves are different.... at-least on some websites they are. (lower)
I would personally say it's a bit excessive to replace the entire thing if it isn't completely broken, I would not say that is at all standard practise, unless of-course your mech has a loan shark he needs to pay off quick...
if you're game, perhaps remove the strut assembly.
diy here: http://www.completervr.com/viewtopic.php?f=23&t=16
and inspect the unit yourself.
I'm going to go and say you have a worn pad and that's all, perhaps just real bad shocks which is personifying the suspensions shudder, bounce, etc.
As for the KYBs you were talking about, we don't have the 'premiums' here, but they sound like an uprated shock, so might be a better option for a stiffer, firmer more direct ride...
I'm driving around on what can only be described as a pinch and a clunk when I turn left hand corners, and have been since I bought the car a year ago... should replace, will eventually, just don't let it get you too bad, if the car drives fine, then i'd personally say it's a small fix.
As for Mitsu Chille, yeah we have the same problem here, and the word 'import' is simply an alarm bell for 'jackpot' to them. if you find the part that's causing you grief post up and I'm sure we can get you a local supply oem part number to fix it.
edit 2: yes, that is an image extraction from ASA about what the RVR suspension setup would look like.