How to stop downloaded apps sync between iphones?

I have a iphone 5(for work) and itouch 4 gen.(for gaming, music, movies), when ever i download a app on one of those it gets downloaded on the other too, how can i stop this as i don't need two copies of it and it wastes internet.

Added (1). Ps they both use the same apple account if that helps on anything

It has to do with i cloud but i'm not sure what it is go to apple.com

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