Unless you have an extremely controlled environment, you are not going to get pictures exactly matching. Simple things such as a change in lighting will make them different.
It sounds like you are looking to identify some kind of change. This is probably a good use case for AI. This is something that will take quite a time investment.
If you don't mind spending some money, there is bound to be an existing company that makes an AI product that does this:
https://apps.meraki.io/en-US/listing?q=AI