How to find files in different specific folders?
I don’t think this is possible in Finder.

You can get the desired search result using HoudahSpot. HoudahSpot is a third party file search tool that uses the existing Spotlight index. Full disclosure: I am the developer of HoudahSpot.

With HoudahSpot you can search in several folders at once. This would however require that you list all “auto_saves” folders you want to search.

I recommend, you search for image files in HoudahSpot and then use the “path filter” feature to show only search results where the file path contains “/auto_saves”. In HoudahSpot you will find the filter field right above the list of search results. Set it to “Filter by Path” and enter “/auto_saves”.

You can save your HoudahSpot search as a template so you can return to it later.