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While there are some who write "NCII or CSAM", the way that I treat it is that NCII (non consensual intimate imagery) is a superset which covers both. That is to say that CSAM is a subset of NCII (as it's accepted that minors can't give meaningful consent).
That said, being very specific can be useful to make things clearer for readers.
There are thorny questions, of course, like if they engage in a potentially unwise decision to engage in sexting with peers, is that the same as other groups sharing such imagery? Strong language like "CSAM" probably doesn't fit there.