What about Saavik being played by Kristie Alley and Robin Curtis? Obviously a different continuity there too.
They only had 2 actresses play Saavik because they couldn’t get Kirstie Alley back and Star Trek III included the character in a big part so it was necessary; putting Spock, Sarek and Pike in DIS was not necessary. No one can ever say Star Trek II And Star Trek III aren’t in the same continuity...