I saw one ex and one regular waterball... the ex one (at :42) floated the opponent over rain's head and the regular one (1:16) traveled him across the screen. I dont know if thats the difference between the two. Maybe one is just armored or takes meter away.
I also saw a regular and ex water up kick. The regular

41) pops the enemy back and the ex

47) seems to go higher with anti-air properties.
I saw a standard water blast

53) with no ex
The ex roundhouse (1:03) looked like it is possibly a parry but the normal roundhouse (1:14) was clearly used as a part of the combo
The ex teleport

33 & 1:07)... didnt see a standard teleport
Triple lightning

46) single (1:15)