Glad to be here to give you help, don't worry, it's so simple that you must find your photos. The fastest and most effective way is to utilize iBoysoft Data Recovery for Mac, you can view all ways below:
- Assuming you have turned on the iCloud, you can just access iCloud.com in your browser. Then sign into your Apple account, and you can Restore Files in it.
- Assuming you have backup your files in Time Machine. Open the Time Machine in the Application in the Finder, then look through the timeline on the right to find your replaced files. Then choose Restore.
- You also can use iBoysoft Data Recovery for Mac, the easiest way to find lost, replaced, and overwritten files on Mac. Just free download and open, then click "Search for Lost Data" or click "Type"(because you want to find photos). After scanning, preview and click Recover.
It's a piece of cake, right?
Also read: How to Recover Overwritten/Replaced Files on Mac?