i3-7100U + 920MX or i3-6006U + 940MX?

Solution
Yes the CPU is the same in core/thread count, but the GPU has different number of cores.

Different number of cores is a greater difference than only a difference in speed.


I am well aware that those cards would be better, but their price is also twice of these systems I'm looking at.

So then you say that even though the i3 6006U has 0.4GHz less, the 940MX makes it better than the other?
 
Yes the CPU is the same in core/thread count, but the GPU has different number of cores.

Different number of cores is a greater difference than only a difference in speed.
 
Solution