How do you say It doesn't matter. Either one is fine.

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Answer

I usually say.  No me importa

Answer

Da igual - everything is equal (in the sense you do not care about something)
No me importa - I do not care
No importa - It does not matter 
No pasa nada - Nothiing is happening (in the sense, nothing wrong is happening, everything is ok)
As you can say, generally, all of these phrases are synonyms and we use them when we want to say "Never mind" 
I hope it helps you. 
If there is anything else I can help you, don't hesitate to ask me
Have a nice day.

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Hola, It doesn't matter significa "No importa" "Eso no importa" "Da igual" "Qué más da" todas estas son expresiones sinónimas.
Either one is fine = cualquiera está bien.

Entonces sería: "No importa, cualquiera está bien". :)
Saludos cordiales.

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Depending on the context I would translate the first one as:

-Da igual
-No importa
-Qué más da
-No pasa nada

But they all mean the same, really. As for the second:

-Cualquiera me vale

¡Un saludo!

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Yo diría: "Da igual. Cualquiera está bien" o "Da igual. Cualquiera me vale"

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