I'm a little confused as to when Sydney is on where, so it's on in Australia, then it's on P+ internationally, then on CBS the day after?
Time zones. If you're on the east coast of the U.S, the time different is 16 hours, 19 hours for the West coast and given it's set and filed in Australia, they probably want to let them have the world premier.
I'm fully aware of Time zones It seems to be stated in a lot of places as 10th in Australia, 13th on CBS, and other markets internationally at a later date on Paramount Plus, but elsewhere suggests Paramount Plus themselves seem to have said its 10th worldwide.
there is amandated minimum percentage of cast and crew that has to be Australian, otherwise that production wouldn't fullfill the legal requirements to save Paramount/CBS precious Australian "network broadcast rights" or something like that. It's actually the main reason the show went into production in the first place - as after mergers and such that network lost one of it's long running Australian staple shows. Also NCIS: Los Angeles creator Shane Brennan, is attached. He relocated back to his homeland for this I think.
While there's already another thread for this (and it's probably more appropriate to make your tributes there) I figured we should at least acknowledge here the death of David McCallum, aka Ducky at 90 years old. He was the last of the OG NCIS's original cast still on the show, even if his role was greatly reduced in recent seasons he was still listed in the main cast. The actor who's been there the longest now is Sean Murray (McGee) who was recurring in the first season before being promoted to main cast in the second season. Then Brian Dietzen (Palmer) who first appeared right at the end of the first season, then was a recurring role right up until becoming main cast in the tenth season. Rocky Carroll (Vance) was introduced in the fifth season and became main cast in the sixth, and that's everyone from the show's first decade that's still there.
I'm now kind of hoping that once the strikes end we can get a special tribute episode for David McCallum. If they could reunite former cast members (Cote de Pablo, Michael Weatherly, Mark Harmon, Pauley Perrette, et al) to say goodbye to him and the character of Ducky...