@OP This is what 'already uploaded' tag is for. If you need to delete the dupe - use it, and provide a link to the og gallery when you are filling in the expunge petition. Also, similarity search is a thing - you can use it before uploading to see if something already was posted to prevent such occasions.
In your defense, your gallery contains one image absent in /g/1218640/711c43e845/ - although it is but a back cover.