qvl lists combinations that have been tested. If ram maker list it as 3600, it should run 3600. It just has been put in that exact motherboard and had speed checked. Chance of issue isn't zero, but is very low. Early zen was picky with memory, newer zen isn't.
Back in day, if you bought 2 sticks of ram and then bought 2 more it might not work, was safer to buy kit of 4 sticks tested to all work at same time, qvl lists were important back then. Now some one upgrading two 8gb sticks to four wouldn't buy four 8gb stick kit and remove the two 8gb kit just to be safe. Chance of issue is so tiny it is not even a concern anymore.
There are only 3 ram makers, all the different brands just add heat sinks and rgb to chips from samsung/micron/hynix. Your unlisted on qvl ram could be exactly same ram chips as one that is listed, packaged by different company with different heat sink stock on.