Is this a different note type to “repost”?
Discussion
No, just a function of how the client handles it when reposting.
It would make sense to me to have a distinct note type for deliberately “retweeting” a note, vs any reaction resulting in a “retweet”
We're not talking about retweeting.
Rebroadcasting just means that it is sent to all the relays you use, that way they don't have your reaction without the original event referenced.