Are these acceptable for memory additions?

[MplsBob]

I currently have two 4GB Corsair Vengeance mems="cmp24gx3m6a 1600", for total of 8GB.

I want to expand to 16GB by adding two more 4GB mems.

I can't find can't find 4GB Corsair Vengeance mems="cmp24gx3m6a 1600".

Would the below be acceptable an acceptable addition?

CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMZ8GX3M2A1600C9B

Thank you in advance for your kind help. I know nothing about memory.

 

[kbp]

Will be just fine..

 

[sm625]

I wouldnt run 4 sticks, it increases the risk of instability. Do you really need 16GB?