I am building a new system, which I have done before. I bought everything at the same time from AMAZON including Corsair 1600 MHZ (PC3 1200) DDR 3 Vengeance 9CMZ4GX3M1A1600C9B (2 x 4GB) sticks and +Corsair Vengeance (2 x 8 GB) DDR 3 1600 MHz (PC3 12800) also labeled Desktop Memory. CNL16G3M2A1600C10B.
I have installed all 4 sticks and have now discovered the (2 x 8 sticks) are LAPTOP RAM (204 pin). The (2 x 4 sticks ) are desktop memory with 240 pins.

I had NO trouble installing either set, 204 versus 240. I have researched various sites and can find NO reference that the two are incompatible. Are they?

Can I use both type of pins at the same time in the same mobo?

Many thanks in advance.