Is it possible to rename Widgets? If you place a widget it gets named Widget N, but even after reinstallation N keeps counting where it stopped, so the first created Widget is “Widget 43” for example. (Nothing Phone 2)
You can try to export your preset and give it a name. When you import it back, the space name will take up that name.
But importing is a pro feature 
I have somehow managed to reset it to “Widget 50” as first Widget if I clear cache of some system apps (don’t exactly sure which) and reinstall Kustom. I think there is no real solution, so thanks for the suggestion.