In KDE, go to Systemsettings -> Aparience -> Gtk Styles and Fonts, in GTK Styles box, select what theme you want to use for GNOME aplications. Start GNOME session and see if theme is aplied.
In KDE, go to Systemsettings -> Aparience -> Gtk Styles and Fonts, in GTK Styles box, select what theme you want to use for GNOME aplications.
Start GNOME session and see if theme is aplied.