I saw it today...and I'm now giving YOU the information on the type of dub (4Kids, RAI english).
The movie was truly a mix of both english dubs. I think that the whole idea was to just have one english dub of the movie (to avoid confusion) so they made the dub a mix of 4Kids and RAI english.
Both 4Kids and RAI terminology was used. 4Kids terminology was things like 'Sparx'(Domino in the RAI version) and RAI terminology was small things such as 'Dragon's Flame' (Dragon Fire in the 4Kids dub.)
As for voices, Bloom, Stella, Tecna, and all the Alfea teachers had their 3rd season RAI voices while Musa had her 1st and 2nd season RAI voice. Flora, Daphne and all the pixies had their 4Kids voices.