Applied to 2 jobs at same company - accepted job offer 1, and NOW hearing back for other position ?

Hello!
So I applied to the same company, different departments at the same time. I got an offer and accepted one position (accepted just as of yesterday) as everything checked out, but lower pay unfortunately. I did reach out to the position of the other department, but I never heard back so I moved on.

Well I just got an email today for the other position if I’m still interested. Yes, I’m still interested, but I don’t know how to reply nor what to do since I already accepted the other position at the same company...

Any advice or feedback is welcomed...!

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