if they are zebras doesn't that mean that they will be more vicious than my socolofi?
I wouldn't quite use the term 'vicious', but zebras tend to be motivated toward being among the most dominant fish in the tank. Hoowever, each tank set up is different and even the personalities of fish are different, so hard to really predict. For now, though, the established fish, at least initially, will typically have the upper hand.
so you are looking for black markings on the top fin? because although you can't see it in the pics i posted, both have a couple black dots on their top fin, but they are JUST dots, they aren't a line or anything. . . .
There should be signs of black fin margins on the dorsal, anal, pelvic and black on the caudal fins as well, and this develops early on even when they're tiny fry less than an inch (as the one below):

But even without taking the lack of black fin markings into consideration, the blue ones you've posted bare a stronger semblence to the cobalt blue zebra. Post pics of them again when they've put on a little size and are about 3 inches.