I also have the GOG version but I am not using GOG Galaxy. If you log in to GOG and look at the offline installers, there are currently two versions available to download. The one shown in your screenshot (which by the way seems to offer an update/upgrade of some sort as it reads patch 8 TO EA v4.1.1.2064610) as well as a clean install which only shows v4.1.1.2064610
In short: v4.1.1.2064610 is the current valid patch9 version number.
When using GOG Galaxy, I guess you only need the "Baldur's Gate 3" entry which also shows the correct version number. Ignore anything that has "patch8" in it.