I'm not sure I understand your question correctly, but 10.23.0 still has the Input reference set selector.
If you mean that they are different, then that means that Mendix updated them and you can't use an older version, because they are part of the Atlas UI.
In Mendix, the availability of widgets depends on the version of Studio Pro you’re using. If a widget is missing in a newer version, it typically means one of two things:
Hi,
You're on quite a recent build of Mendix that is probably trying to use the react client.
The reference selector and reference set selector are not supported in the new React client for Mendix so I assume they've removed them from the toolbox.
You should be switching these selectors for the new Combo box widget instead.
See for more details: https://docs.mendix.com/refguide/mendix-client/react/#reference-selectors-drop-down
You should be able to see any of your reference selector widget, right click and "Convert to Combo box"
Thanks,
Adam