so if i change PPA to another with geany 1.33 compiled with gtk2 it would be work or not?

If it's built against GTK+ 2, it would work just as it did before.

Or how can i enable my old theme with gtk3?

You would have to port it to GTK+ 3 CSS. Unfortunately they changed just about everything between v2 and v3 to do with theming, but if you know CSS already, you'd probably find it easier/better in GTK+3.

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