Duplicate image size

I want to upload an image that has been Uploaded before the difference is How about a image size 3.76 MB .jpg and I want to upload 3.81 MB .jpg should i even bother?

Read: help:upload "Check for Duplicates".

Most likely not, especially if there are no perceptible visual differences.

That said, you can paste the URLs on this site to get a technical comparison if you want to be thorough: https://duplicatebooru.zipfiled.info/