Question RAM

Sep 8, 2019
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Okay, so, this is probably a stupid question but I am not very familiar with computers, but i'm trying to get more RAM and I know that you need to put both sticks into the same color, but do they have to be the exact same? My computers uses DDR4 ram and I have a pre-built gaming PC with one stick of XPG 8 gigabyte ram. Now, I would just buy another one of those but unfortunately, that company only sells theirs in pairs, and I only need one 8 gigabyte stick. So, would it matter if I bought another stick from a different company? Again, i'm sure this is very stupid but I am unfamiliar with computers and don't wanna waste my money.
 
Well that helped a little, but not as much as usual.

Its a 2666mhz 8gb stick at least.

Can you take out the stick and look for a model number.
Might says something like this:
MD4U083618BCDA
or
F4-3200C16D-16GVGB

I really like the way G.skill names ram. The model above clearly tells you it is 3200mhz, 16gb and C16.