@forteller Yep, they do the same thing:
$ gsettings get org.gnome.desktop.wm.keybindings switch-applications
['<Super>Tab', '<Alt>Tab']
And there's a setting to (always) switch between open apps in a workspace:
$ gsettings get org.gnome.shell.app-switcher current-workspace-only
false
Not sure if you can have Super + Tab switch between windows in the current workspace though.