That is one of my golden zebras. Yoyo's usually have visible "y's" in their stripes when they are younger.
Not the greatest picture but you can see the pattern. They sort of lose the y's when they get bigger.
That big girl is a yoyo too. They get much bigger than the golden zebras. I'm pretty sure the one in the first picture is full grown.
The one in the picture above was sold to me as a golden zebra but grew up to look more like some kind of hybrid yoyo zebra. My best guess is that there is a lot of sexual dimorphism in that species. The males look very different than the females.
They were all very hard too tell apart when they were smaller. Also, this is a Burmese boarder loach. They are much more shy But also looked the same when it was smaller.
I had a hard time telling them apart at first. I'm still not sure what species the hybrid looking one is but it loves to harass my angel fish. None of the other loaches bother them at all.
Hope that helps or at least gives some frame of reference.