Adding more ram, dual channel issues?

[barret50]

I have this currently: http://www.centrecom.com.au/corsair-ddr3-8gb-2x-vengeance-4gb-1600mhz-cl9-cmz8gx3m2a1600c9

 

I am looking to upgrade to 16gb and need lower profile modules to fit under my cooler

such as: http://www.centrecom.com.au/corsair-8gb-2x4gb-ddr3-1600mhz-cl9-low-profile-vengeance-black-cml8gx3m2a1600c9

 

If I have a dual channel kit and add another, will that create any issues? Are these dimms close enough/the same, will compatibility be an issue? 

 

thanks