Dear all, i have KHX24C11T3K2/8X 8gb kit of 2 in my PC, now I want to upgrade ram memory, can i just buy new version of HX324C11T3K2/8 8gb kit of 2? I`m worry about collision of older and new memory kit 🙁 is it safe to use those two kits? just don't want do throw money for nothing if you understood me, sorry for my bad english. I wish you all the best, sincerely yours Josip. have a nice day 
P.s. : main difference is
• XMP Profile #1: DDR3-2400 CL11-13-13 @1.65V old memory
• XMP Profile #1: DDR3-2400 CL11-13-14 @1.65V new memory
PC specs:
Asus Maximus VII HERO
I5 4670k
Asus Strix GTX 970
Coolermaster V650s
http://www.kingston.com/en/memory/search/DisContinuedPartNumbers/Default.aspx?PartId=khx24c11t3k2/8x
http://www.kingston.com/dataSheets/KHX24C11T3K2_8X.pdf
http://www.kingston.com/dataSheets/HX324C11T3K2_8.pdf

P.s. : main difference is
• XMP Profile #1: DDR3-2400 CL11-13-13 @1.65V old memory
• XMP Profile #1: DDR3-2400 CL11-13-14 @1.65V new memory
PC specs:
Asus Maximus VII HERO
I5 4670k
Asus Strix GTX 970
Coolermaster V650s
http://www.kingston.com/en/memory/search/DisContinuedPartNumbers/Default.aspx?PartId=khx24c11t3k2/8x
http://www.kingston.com/dataSheets/KHX24C11T3K2_8X.pdf
http://www.kingston.com/dataSheets/HX324C11T3K2_8.pdf