"I think I perfromed in this a few years ago..... I performed in Cinderella but I don't know if it was this version. Anyone know? The opening number was something like "Cinderella, Cinderella it's the tale of Cinderella. There'll be magic and suprises, and spells with magic wands."
No, that's not the right one. The opening number for this musical is either "The Prince is Giving a Ball" or "The Sweetest Sounds".
I think it will be deemed a revival, but Doug will be eligible.
However, depending on how the rest of the season is the producers could probably attempt to get it deemed a new musical (obviously not eligible for best score). I doubt they'd go that way just because it would ruffle feathers for no reason, especially since it would be marketed as "R&H's."
It's funny the joke Sondheim made about "The Gerswins' Porgy and Bess" just in case you'd confuse it with Hart's Porgy and Bess. In THIS case, there are multiple versions.