Not claiming to know all, not by a long way. But as I read on various forums, there is one single EASA directive which the various countries interpret in their various ways. I have a vague memory of one CAA insisting both radios should "do" 8,33 but were refuted. No guarantees, though.
All this under the assumption you mean EASA-land, which in the future may or may not include UK. Outside EASA I have not the slightest idea, and am not the slightest bit interested.