Do you think I can go wrong with the Ram upgrade?

I want my SK HYnixhttps://www.amazon.de/SK-hma851s6cjr6-PC4-2666-DDR4-2666-MHz-Arbeitsspeicher/dp/B07GH7RRTM/ on my notebook

2X4GB

do something wrong when I go to 16 Gb

https://www.crucial.de/memory/ddr4/ct8g4sfs8266/ct12409459

(2X8GB)

Upgrade?

I already have knowledge about something but am afraid of what breaks?

Not really, no. Laptop boards are often less flexible when it comes to memory size, timings and especially Voltage goes but both DIMMs run on 1.2V and 8GB should also not be a problem.

The worst thing that could happen to you is that the computer does not start. You can't damage anything.