Can this Corsair memory be combined?

[welshdragon]

Hi Guys

I'm not too great when it comes to memory so I'm hoping someone can help?

I've got this 16gb Kit:

Corsair CMZ16GX3M2A1866C10 Vengeance 16GB (2x8GB) DDR3 1866 Mhz CL10 XMP

Timings: 9-9-9-24

Could I combine it with this:

Corsair Venegance 16GB 1866 Mhz CMZ16GX3M2A1866C9 (timings 9-10-9-27)

Would it cause any problems/instability? Is it best to find an identical matching pair?