I don't know of any way of doing that unless you have Database programming knowledge.
LR is a single user system and never was intended to be used by multiple people.
You could have all your users export the images they have worked on to a separate folder as a reference every time they are done.
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You can see which pics have been modified recently by doing View > Sort > Edit Time in Library grid view. But that won't tell what the changes were.
Thank you for your reply.
This proved to be helpful, thanks a lot.