În the latest Apple Photos version you can copy the edits you made on a photo and paste to reuse them on another.
Photo editing has received a big speed boost with the latest version of Apple Photos. You no longer need to make the same time consuming edits on a long string of photos.
After you make the changes you’re happy with to a photo, you can just copy them to clipboard and then paste them to all the author photos you think they are suited.
You will find the copy and paste options on the Image menu. For an even faster editing you can use the keyboard shortcuts, which are ⇧⌘C for copy and ⇧⌘V for paste.
To resume, copy edits on the photo you’re happy with changes made and paste them to all other photos they look good on.