wooops , that was a "i just woke up answer, sorry.....
yeah all 4 of those will work together, your system "might" need some tweaking after installation... "some" mobo's have issues with all 4 slots filled.....
a lot of mother boards default to 5-5-5-15 settings.... check the latency timings on what you have now compared to what the 2 new sticks have. You might consider changing the timings in the bios if so inclined or just let it run on default if not a power user....