Copy/Paste for multiple photographers in LR

Auto Sync allows you to edit either individually or as a group, depending on whether you have got only a single image or multiple images highlighted at a given time (with only one image highlighted, the setting of Auto Sync makes no difference). So, you can first do basic processing across a whole batch of similar images, then you can click to highlight just one image and edit only that, then move to the next image and so on. Each change supersedes whatever was done previously to that image, so far as that particular adjustment is concerned. So you can come back and reconsider some specific aspect again, across the whole batch, and only that thing will be further updated - the other individualised editing of the photos will not be overwritten. It's as selective as you want it to be.

The same is true with Sync: you decide which aspects of one primary image's current processing, you want to duplicate onto other images - as many other images as you care to highlight, along with this primary image.

Sync uses some logically grouped settings besides the single slider options presented: e.g. "Color Adjustments" or "Sharpening" - it's the same as happens with Copy / Paste or when making a Preset.

But using Auto Sync you can freely apply onto one or many images, the move of any single adjustment slider (or, a sequence of such single changes). Each action carried out becomes a separate new History step, for each of the affected images.