Questions about RAM compatibility

[mikehornik]

This may seem like a stupid question but I currently have 2 4gb crucial ballistix sport LT 2666 in red already installed in my pc. I want to buy 2 more of those 4gb sticks so i can have 16gb of ram in my pc. However the red ram i already have installed is out of stock on literally every website in the red colorway but they have the grey colorway. Do you think that the colorway matters at all in ram compatibility?
The RAM i have:
http://
The RAM in the grey colorway:
http://

 

[CountMike]

Color itself doesn't matter (of course) but gray one has Samsung b-die chips. May not matter though as other things are same.