As Dave indicated I would have been surprised if the Units are not all in the same Range of a few counts (due to closed case calibration)
The more interesting Part for Professionals would be the long term aspects of the calibration values, the reliability in general, the reputation, the availability of pare parts, Robustness etc.
I really believe that a Brand who needs to fight for the Name and the Market Position such as Fluke, Keysight, Gossen etc. needs to design and tighten there internal Specs to achieve a life pan where no adjusting is required for at least 10 Years.
Nobody - really nobody want's to adjust any Measurement Device in Business Environment!
If a Measurement Device is found out of call the company is really in big trouble and need to issue a report with risk assessment.
For Hobby users this could be completely unimportant - and as always - you get what you are pay for
My Proposal for the average Hobby User: buy a reliable, Safe and easy to Use Multimeter from a Brand with good Industrial Reputation