wondra2 :
I am concerned about getting exactly same model for both and home use - would that perhaps cause more strain on wrists (due to same shape)? Do you have personal experience using such setup - does it have impact?
Factually, it's a matter of how well the mouse is made and to what expectations in the first place. If it's just a junky basic mouse like the Logitech M100, the extended hours on it could potentially do some damage. If it's say, a mouse specifically designed for ergonomics, it's about as good as you'll get anyway.
The issue with injury is more related to the positioning your arms and wrists are forced into - if you spend a lot of time in that bad position, it's bad regardless of if you use two different mice that facilitate it.
Reduced to some basic "math": timeInUse * (mouseAErgo + mouseBErgo)
If mouseA and mouseB both have bad or the same bad ergonomics inherent in their design, it doesn't particularly matter if they're actually different mice, the root problem is still the same.
If you have concerns, something you may want to consider is purchasing a basic vertical mouse. There are big names for $40-100, but honestly, if you go online to eBay you can find a passable one for like $15. Provided, of course, that your work isn't intimately dependent on having a quality mouse - the eBay ones should suffice just fine for office work, and I doubt you'll get any shade over using your own preferred mouse if you claim your wrists get sore.
Hell, maybe see if you can expense one of the better ones out!
Best practice is to take regular breaks. If you're looking for an ergo mouse at a decent price, something like this might work:
https://www.aliexpress.com/item/-/32817353745.html?spm=a2g01.11143849.kc94488.280.5b18bf59UKyKM4&scm=1007.16233.92206.0&pvid=6f92a542-a6f0-442c-8ae8-aad5f0e1a2ea
Note: I have no experience with this model specifically, but it's at a price point the quality is likely to be acceptable.