Can I combine 2 different memories of the same brand?

Nov 1, 2017
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To be more specific i have Corsair Dominator Platinum 8GB DDR3 Non ECC CL9 2133MHz (CMD8GX3M2B2133C9) (Kit 2 x 4096)

and i wish to add more 8gb,

Considering the price of this memory has barely came down worldwide, and it almost out of stock ( i cant find the specific model any more in my country) is it GUARANTEE that my computer work with one of the following memory?

1) CORSAIR DOMINATOR PLATINUM 8GB DDR3 NON ECC CL11 2400MHZ (CMD8GX3M2A2400C11) (KIT 2 X 4096)

Also is it possible to add just the cheapest 8gb dual stick from corsair?

or should i sell my current memory and buy a set of 16gb?


PC Specs
Mobo: z97-AR Asus
CPU: i5-4690K

 


In my experience it is 60% hit, 40% miss.
If you had something sitting on the shelf then no harm no foul to try it, but ordering something you cant easily return is risky.