I knew it, i have played and finished both beta versions and i can tell you that there is no difference.......
I noticed that sometimes the continue screen have some bugged numbers and letters, like "A2F0A, etc", in stage 5 the man-eater plant doesnt expels venom polem and the lake doesnt turn bloody red and so the red skeletons didnt appears too, in the room with various bone pillars one above the others changes the music to boss theme, while in (U) it didnt happens. Also in stage 4-2 the secret candles with a 1up and crystals doesnt appear. I didnt know if all that things is because its the (E) version tough.
edit: Noticed that when I use a continue I didnt need to start from the beggining of the stage, I start in the checkpoint. Also I can ignore mid-bosses like The Creature and Blue Giant Armor that punches. Some sounds effects sounds strange too, Eric up and diagonal attacks inst the same too, normally you only need to tap the button, but here you need to hold it or otherwise he will return instantly to his stopped animation. Some things that I mentioned could be because that is the European version and because it starts in Easy Mode. I didnt changed to Normal (forgot lol)
edit 2: Changed to normal mode when I started a new game with Eric (Im playing with John before). The choose your character doesnt appears more after a continue. But the intriguing part is that some enemies still dont appear, like the crows after Stage 2 Water Wizard mini-boss. Also, look at my lifebar, wtf?! I died when I received another attack tough.
Also I noticed playing with John that at least the 1st magic book in stage 1 doesnt make your weapon better, its useless.