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What two numbers need to be removed?

The first one from the left circle, the second one from the right.

enter image description here

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    $\begingroup$ Hi Carlo, and welcome to PSE! When posting puzzles that you didn’t create yourself, it’s important to cite the source where the puzzle is from. Happy puzzling! $\endgroup$ – Bass Apr 3 '18 at 14:39
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I would remove:

4817 from the left and 1387 from the right

because:

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

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    $\begingroup$ Thank you very much for your solution. I think that its correct answer! $\endgroup$ – Carlo Pazolini Apr 3 '18 at 8:13

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