a different kettle of fish

US /ə ˈdɪf.rənt ˈket̬.əl əv fɪʃ/
UK /ə ˈdɪf.rənt ˈket̬.əl əv fɪʃ/
"a different kettle of fish" picture
1.

un asunto completamente diferente, otra cosa

something that is completely different from something else previously mentioned

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I thought I could handle the new project, but it turned out to be a different kettle of fish.
Pensé que podría manejar el nuevo proyecto, pero resultó ser un asunto completamente diferente.
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Dealing with clients is one thing, but managing a team is a different kettle of fish.
Tratar con clientes es una cosa, pero gestionar un equipo es un asunto completamente diferente.
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a fine kettle of fishkettleput the kettle onfishfishingdifferentdifference