Thanks for the reply. I already have 1 stick that is 11-12 A1. I accidentally bought same brand, same speed. The only difference is the timings which is 11-11 A1.Welcome to the forums, newcomer!
You're better off parsing a link to the ram sticks you're trying to work with, the make and model of your motherboard and the BIOS version for said motherboard. Ideally you should avoid mixing and matching sticks of ram and instead opt for a dual channel ram kit to ensure stability. Ram upgrades should be seen as you would with buying shoes, there's no point in buying two different color/sized/design shoes other than to make you look silly.
Even buying the exact same RAM isn’t a guarantee they will work together. RAM is sold in matched kits for a reason. You can try it, it might work or you might have issues.Thanks for the reply. I already have 1 stick that is 11-12 A1. I accidentally bought same brand, same speed. The only difference is the timings which is 11-11 A1.