Compare fonts > number of glyphs

I am trying to match two fonts for glyphs count.
One has 514 glyphs and the second has 518.
I would like to know which glyphs are missing.
Using Compare Fonts is not yielding any results.
The field for missing glyphs is not telling me nada!

Open the font that has 518 glyphs
& Select all the glyphs & create a “List Filter” & Name it,
then Open the second font & right click on the Filter that you created ,
it will show you the missing glyphs.