The WDW Carousel is not the one I remember at Disneyland. For one thing, at the end of the show in DL the audience would ride a ramp upstairs to view a model city before exiting on the upper level. (There's no upper level at WDW.) And they changed the audio leaving out the many references to General Electric. The voice actors aren't even the same.
If they moved the carousel from DL to WDW, it was only the animatronics. The building stayed behind and was redesigned into America Sings.
But even with all the changes, the WDW version still pays homage to the original, and it's definitely worth seeing.