I went and checked the 2 icons after reading the OP as i thought i must of not noticed summert between em.
To me anyway, they are perfect distinguishable.
The Icon is so small, what is there to change? I mean I can tell the difference. And if you're not sure, you can check the title too.
It's not confusing at all. It's perfectly fine. Even then, it says on there "Sony PS Vita".