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I've seen both Imperial ranks get mentioned. Is there any different between them?

grand admiral is superior to a fleet admiral

https://starwars.fandom.com/wiki/Rank_insignia_plaque#Imperial_Military

https://en.wikipedia.org/wiki/Military_rank#Modern_ranks

https://starwars.fandom.com/wiki/Forum:Knowledge_Bank

bump.

Any additional clarity on this?

Your question was already answered. Grand Admiral > Fleet Admiral.

Typically if a rank has "Grand" in the title, it is above all other ranks in that particular branch.