Emailing users vs buyers

Newer CSM here... I am working on crafting cancellation emails to group users as opposed to the group admin (more likely the buyer). I am trying to do research on this, and just getting general cancellation email advice, but what I am looking to learn about is how to differentiate the email when contacting the head of the account vs the group users in the account. Anyone have any advice on what to do differently when emailing group users vs admin? Or any advice on how to do further research on this?