Hi guy's! I have one stick ddr4 8gb hyperx savage @3000mhz. HX430C15SB2/8. I want to upgrade to 16gb. At the store there is same, exact memory just with one difference. It's HX430C15SB/8 (without number 2). What does mean that number 2? Can i pair these two? I mean, will it work fine? Or should i try to find identical stick?