How can I distinguish certain images on Android and iOS?

Hi, how are you?

There are two identical images, but only one image has a specific key value Is there a way to distinguish a specific image from a computer (mobile, app) perspective using this key value? (When I changed it to an array of bytes, changed one index value, and sprayed it on the view, the image was natural, but it didn't appear.) ))

It's supposed to be on the view. I came to ask for advice because my knowledge is short.

Thank you Have a nice day