No, if I recall correctly, the 3.3 just had a standard Maxx diff with a 4 screw outer case, which held the pinion mesh much better and reduced blowouts. The diff was otherwise the same.
There was lots of talk about this on the Traxxas forum.
And the new emaxx diffs are supposed to be stronger than the revo diffs, and backwards compatible so that they can be used in a revo. I may have to get a set and try them in my tekno revo.
My new maxx made it in today......she is a beauty.....the shock towers are 3.3 towers as well and the tires have taller tread they made them more of a paddle tire. First mod is to ditch the stock wheels and put my SPI offset wheels on they make the truck 2'' wider which is good for high speed turns. the less time my maxx is on its lid the better