The yellows are definitely cherry shrimp, i got them around 6 or 7 months ago when they bred from my brothers red cherry tank and started with a group of 8 and added a few more. The caradina shrimp i added a few months ago and the guy said they were in a tank of just blue bolts and pintos so they are as pure as I'm aware.
The yellows are definitely cherry shrimp, although i bought two quite large yellow shrimp from my local fish store. They're the biggest I've ever seen but they assured me they are actually yellow cherry shrimp (one of them was actually berried when i purchased it so it layed eggs in my tank). I don't think this shrimp gave birth to the shrimps in question however, as there were more smaller shrimp that look like the one in the picture, and the large yellow shrimp i bought has only given birth once. Also, it is around mainly yellow babies and the shrimp in question is slightly smaller than a fully grown yellow cherry male.
My brothers dismantling a very small tank, maybe 8 -14 litres and i was thinking of putting them in there and breeding them because they look heaps nice and even better than the photos, but ill have to see.
Thanks heaps for the help!