übereinstimmen
to agree
To have the same opinion or view as another person; to be of the same opinion.
Ich stimme mit dir überein, dass wir das Projekt verschieben sollten.
I agree with you that we should postpone the project.

to agree / match
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to agree
To have the same opinion or view as another person; to be of the same opinion.
Ich stimme mit dir überein, dass wir das Projekt verschieben sollten.
I agree with you that we should postpone the project.

'Übereinstimmen' (to agree / match) is a separable verb. The prefix 'über-' separates in main clauses and comes at the end. The word comes from 'über ein-stimmen,' which means something like 'to arrive together at one voice/opinion.'
Seine Aussage stimmt mit den Fakten nicht überein.
His statement does not match the facts.
In both meanings, the verb is used with the preposition 'mit' and the dative. It expresses what or whom the agreement or match is with.
Ich stimme mit deiner Analyse vollkommen überein.
I completely agree with your analysis.
You can recognize the difference from the subject: When people are the subject, it is usually about opinions. When facts, data, or objects are the subject, it is about consistency or identity.
Die Experten stimmen darin überein, dass Maßnahmen nötig sind.
The experts agree that measures are necessary.
To specify the content of the agreement, the construction 'darin übereinstimmen, dass ...' (to agree that ...) is often used. The word 'darin' points to the following subordinate clause.
Wir stimmen darin überein, dass wir mehr Zeit für dieses Projekt benötigen.
We agree that we need more time for this project.
When it is about consistency, the subjects are often abstract or concrete things that can be compared: data, results, statements, reports, copies, or versions.
Meine Berechnungsergebnisse stimmen mit deinen überein.
My calculation results match yours.
to be right / to vote / to tune
'stimmen' and 'übereinstimmen' can both mean that something is correct or fits. 'stimmen' is often used for a single piece of information: a calculation, an address, or a statement is correct. 'übereinstimmen' is used when you compare two or more things and they are the same or match each other. Learners can easily confuse the words because both have to do with correctness. Remember: 'Eine Angabe stimmt' (one detail is correct); 'zwei Angaben stimmen überein' (two details match).

Die Daten im Ausweis und im Antrag stimmen überein.
The details on the ID and in the application match.
Die Telefonnummer auf dem Formular stimmt nicht.
The phone number on the form is not correct.