
Be another/a different matter
Separate Concern
Use the phrase to emphasize issues are unrelated and should be considered independently.

She passed the written test, but the practical exam is a different matter.
Conversation Shift
Indicate a shift in conversation to a new topic that needs separate attention.

As for our sales figures, they're good. Customer satisfaction, though, is a different matter.
Contrasting Importance
Suggest that the second issue has a different level of significance or urgency.

He's on time today, but his overall attendance is another matter.
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