I don't really see and similarities between the two, The Seas is much more heavily focused on the 'aquarium' finale, which this won't have. This is more of a traditional Disney darkride (picking the most interesting parts of the movie, jumbling them to fit a ride and then making it as high capacity as possible!) which is more animatronic/scenery focused, from what I can remember of The Seas, it was mainly plain show scenes using screens to show the characters?
It would be awesome if they did have an aquarium at some point, which had projected Sebastian/Flounder in it like they do at the end of The Seas With Nemo & Friends though!