Translation of "Mistaking" in Spanish

Mistaking cadenza with decadence would be a great mistake.

Un gran error sería confundir cadenza con decadencia.

If you say "I was tricked," well that's certainly so but there's no mistaking that you were the one who signed up on a "sweet deal".

Si me dices "fui engañado", bueno, ahí se acaba la controversia, pero no hay duda que fuiste tú quien aceptó ese "buen" trato.