There won't be a problem if I put 2pcs of dual channel kits in a single mobo right? and won't that appear as quad channel in CPU-Z?
There isn't a 4x4gb 1866 Dominator rams in my country T.T
No it won't appear as quad channel, many people will buy a set of 8gb(2x4gb) and later buy another set of exactly the same and put it in and use it and it works just like as if you had purchased the full 16gb as one set.
The problems can come if you don't get the same as what you have and there can be compatability issues so that's why it's important to get the same .