Thank you both for your answers. I guess I feel more confident mixing the two after learning that the CML 16GX3M4A 1600C9 is also XMP Compatible. I guess the packaging didn't mention it was XMP certified probably because they were (Probably due to some licensing issues I reckon) So I will try to mix them and see if the system is stable. Thanks again for your advice!!!!
You're not going to break anything trying it. And if it works out, great! If not, I would return the kit you just bought and seek out another kit just like the one you had originally.