DDR3 SO-DIMM or DDR3L SO-DIMM?

Hello PC Master Race friends!
I have a little question about a Ram upgrade on a slightly older laptop!
Namely, I got a Fujitsu Lifebook S710 from a friend as a gift because he can't do anything with it. I got the thing, because I do not have a notebook myself and do not need a mobile powerhouse, cleaned, SSD installed, Windows 10 Pro played on it and exchanged thermal grease. Battery is absolutely in good condition this is the.
But unfortunately, the snappy i5 only 4GB Ram to the side, which unfortunately with Chrome and something is not up-to-date and sometimes brings the good piece to stutter! Installed is currently 2x2GB DDR3 So-Dimm memory, that is, without low power. I just found a good deal for 2x4GB DDR3 * L * So-Dimm. And I wondered if that makes a real difference whether it is the low power Ram or not. Because the bios should be able to adjust the tension by itself or not?
Or is the Low Power Ram not suitable for this?

The SO-Dimm with low power also works with the full voltage.

https://www.compuram.de/blog/was-bringen-lowvoltage-module-eine-analyse/

But that is only related to their Ram, or is that true for any ram?

This applies to every Ram with LP.

It may happen that the RAM is not recognized, especially if it is read by the BIOS and the BIOS does not support this RAM.