will (G.SKILL X 8GB(1X8G) DDR3 1600) and (G.SKILL X DDR3, 8GB (2x4GB) DDR3 1600) work

Solution
Maybe, it depends on the memory characteristics (apart from voltage, timings, and frequency).

Try them and see, but it might require trying several other modules to find an inter-module compatible combination.

Recommend 2 x 4 GB in one channel (slots 1 and 2, OR in slots 3 and 4), and 8 GB in the other channel (slot 2 OR slot 4) to make the channel capacities the same (8 GB each).

But an even better idea is to get a 2 x 8 GB dual channel kit instead where the modules are guaranteed to be compatible with each other.
Maybe, it depends on the memory characteristics (apart from voltage, timings, and frequency).

Try them and see, but it might require trying several other modules to find an inter-module compatible combination.

Recommend 2 x 4 GB in one channel (slots 1 and 2, OR in slots 3 and 4), and 8 GB in the other channel (slot 2 OR slot 4) to make the channel capacities the same (8 GB each).

But an even better idea is to get a 2 x 8 GB dual channel kit instead where the modules are guaranteed to be compatible with each other.
 
Solution