Even MA or Setup Assistant will recognize and use a properly cloned drive though I doubt that they used CCC or SuperDuper - ASK them what they used.
When you look at the drive in Disk Utility what does it show? Status, partition type etc.
What do you see? If they are folders, fine.
What you may not be able to do is import applications.
Even if they just used Finder to drag and copy folders like user account then is that there? Manually copying FOLDERS is generally fine.
Why did they do this? drive upgrade? or old drive was failing and could not be mounted or repaired?
Swapping a new drive is easy to do yourself. Often folks will remove old drive and put it in a case like WD Passport (though I like self-powered and not bus-powered only) drive cases. And install a new SSD where the old drive was.
You really want the MacBook Pro forum.