What's difference in a 1mg green alprazolam and a blue football Xanax?

They're suppose to be the same but, I've taken both, and I find the alprazolam to be stronger. I don't always feel the effects of a blue, or purple some call it. But the green alprazolam? Oh yes, Everytime! Hope this helps. Mind you, this is just my experience.

One is blue and the other one is green; that is the only difference apart from shape possibly (I don't know the shape of the green ones).