Each country designates their own pennant numbers and also classify their own ships.
This is why the Halifax class is FFH, the Collins class SSG Until recently the Izumo DDH ect.
Numbers matter for nothing either its just a way to ID a ship.
But if you want something mind bending heres one for you:
USS Carr pennant 52 (FFG)
USS Barry pennant 52 (DDG)
USS Bunker Hill Pennant 52 (CG)
All of them sport the exact same number, and also all 3 were at one stage in commission at the same time, they are also not unique in that respects either
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