Emoji: PUA or .CV?

Hello there,
I’m developing a font that include icons/emoji (my first time with emojis) that have different versions of the same glyphs. For example, a ghost regular emoji style and an angry ghost.

I used the emoji Unicode but I don’t know if it’s better use PUA o Character Variant for these different versions. I will have to use PUA for others glyphs that doesn’t appear in the emoji list, but what do you recommend?

Many thanks,
Rafael Jordan