Comment 5 for bug 1799542

i think the "popup a permissions window" thingie is on the roadmap, but it might still take a while ...

to my knowledge there is no way in the GUI to tell the installed versions apart if they ship the same icon (which both gimp installs you have most likely do). but if you start it from a terminal you can start the snap via "snap run gimp" or through /snap/bin/gimp, while just a simple "gimp" should start the PPA version (i'd personally stick with one version though and just remove the one i do not regulary use).