They're basically the same, but not exactly.
The layout is different between the two, specifically the eastern side of both. (The Toy Story Land exit at WDW is turned more south at DL because of the park's layout, so that whole section is shuffled a little bit.) DL's GE is also turned a different direction, so the sunsets are in a different spot.
The rides are the same. The queue for ROTR runs a different path, but not notably. (I can't recall if I went through the queue at Smuggler's Run, but I think it's the same.)
As recently as January, Oga's had slightly different menus between the two. I personally prefer WDW's. (I like the Carbon Freeze, which they didn't have at DLR. And the Oga's Obsession I got at DLR was weird.) I think, overall, the restaurant menus are gently different. (I think the Ronto Wrap vendor is open all day at DL.)
That's a long way to say - if you've done ROTR and SR enough at WDW and your time is limited, you can probably skip those. I find it fun to wander through GE and spot the differences, but you wouldn't necessarily be missing much if you decided not to spend much time there.