You don't have to respond to a request to the police for an interview. If they had enough to charge you they would get a warrant and force you to appear in court. Until that time, I would not voluntarily provide any information or othewise assist the police.
Now that they have your identity and different video footage to compare, they may be able to ID you in the previous footage. However, having experience with store surviellence camera issues, I can tell you that such footage is usually inconclusive. Faces and other identifying information is usually so blurry that the authorities can't use the video. Again, they might be better off now with your photograph and the ability to compare the two episodes of footage, but there likely remain identification issues that pose an obstacle to them.
Moreover, your recent encounter with them is not a crime. You did not leave the premises with any unpaid for merchandise, so they don't have a case against you for that episode.
Therefore, I would not assist them further unless there is a warrant or subpoena mandating my response. At that point, I would not proceed without an attorney.
Please let me know, if you have follow-up questions.
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