Don’t mix them up
Mistake/mistook for
For a moment, I mistook you for your great-grandmother.
I’m sorry, I mistook you for someone else.
I didn’t mistake them for vitamins.
Confuse with
I think you have me confused with another person.
He confused Osiris with Apopis, his mortal enemy.
I think you have me confused with someone who’s far less awesome.
He called you stubborn… but he has that confused with courage it would seem.
I must have confused it with the $900 trillion I am worth myself.
Mix up with
My child was mixed up with another
You’re not mixed up with just hackers; these are criminals.
Man, you really mixed me up with somebody else.
You must have me mixed up with somebody else.
or
I must have mixed up the bags.
I might have mixed up the details.
Got/have it mixed up with
I thought it was next month, I got it mixed up with the lunar calendar dates.
I don’t know. I might have got some of the stories mixed up.
You got me mixed up with somebody else, senator.
Got it wrong
I got the days wrong and I accidentally met Laura.
He’s an emotionally and intellectually vulnerable suspect who got a detail wrong.
They get it wrong, they’re electrocuted.