The earliest Seafires were Spitfires, with hooks and eventually folding wings, and there were even ‘hooked’ Spitfires (without the folding wings) that mainly served in training roles.
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A hooked Spitfire in trouble on HMS Ravager, showing hook and fixed wings
If there is any doubt you might ask yourself was the Sea Harrier a Harrier? There was a lot more visual difference between the GR1 and the SHar FRS1, even more with the GR3; and when you get to the later Harriers then they have little but a passing similarity between the GR1/GR3 and GR5 onwards, much like the later Spitfire/Seafires..