With the implementation on tribble currently your ship mastery level is tied to the ship itself. Fleet and non fleet ships exist independently so you will need to re-master.
It shouldn't be too big of a chore though, mastering a ship doesn't take a huge amount of time if you are prepared to grind it.
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It shouldn't be too big of a chore though, mastering a ship doesn't take a huge amount of time if you are prepared to grind it.