Yep, they make different spring set ups.  When converting a MII 1stGen from a disc to a coil spring the pressure plate was purple.  I've never messed with one for the 2ndGen, but it may very well be blue...  Or.... they got a deal on blue anodizing..  :-)  Which brings up another thought.  Would an early '83-'85 clutch basket assembly interchange with a newer Mark two disc type clutch basket.  If it did, it would be a heck of a lot cheaper picking up a complete MI clutch basket off eBay and swap 'm out.  OK they would need tweeking.  New springs, discs, etc, but it would be solid....