I have the JJCD version with HH included, it has those invisible springs and no different tubelectric 2 ending... I have two seperate CD's though: one normal Jazz Jackrabbit 1 CD and one that came with JJ2, but as far as I know both contain the same version. When I have time, I'll check tho.

That Tubelectric ending is interesting... it's a complete noob layout (esspecially compared to the rest of the level) with very much ammo and even a bird which could be useful in the next level ;p