What two numbers need to be removed?
The first one from the left circle, the second one from the right.
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I would remove:
4817 from the left and 1387 from the right
All the rest of the numbers have a 'match' in the other circle which could be obtained by re-shuffling their digits:
7496 - 9674
6279 - 7296
2831 - 8132
3489 - 4398
2614 - 4216