For the diff Gurus...
 

Hi, can anyone tell me the difference between these rear diffs? One is out of a ver4 type r and the other came out of a ver5 type r. The housings are identical they just have different internal mechanisms. What id like to know is if one might be an uprated part or just why are they different ?
Ver4 :
http://i862.photobucket.com/albums/a...2072009161.jpg
http://i862.photobucket.com/albums/a...2072009160.jpg

Ver5 :

http://i862.photobucket.com/albums/a...2072009162.jpg

http://i862.photobucket.com/albums/a...2072009159.jpg

V4 on the right:
http://i862.photobucket.com/albums/a...2072009163.jpg

V4 on the left :
http://i862.photobucket.com/albums/a...2072009158.jpg

Anyone ?? Just so you know I have put in the ver 5 diff and it is way more tighter than the old one ever was