Not really, but watch it anyway. Anyone who says they truly 'get' Evangelion is lying, so I wouldn't worry about it.

It'd probably be a little better if you skip it, actually. I believe End of Evangelion was the more 'real' ending of evangelion, being newer than (and unrelated to) Death & Rebirth and closer to the TV show's ending. Eva had 3 endings: TV show, Death/Rebirth, and End of Eva.

But really, those are probably superceded by the new Eva movies. Who knows how those will turn out. Maybe GAINAX has a real ending for EVA this time.