What is the correct terminology for this? Multiple matched 123 blocks?

Chances are that if you order them the same day, from the same place, then they were probably ground in the same batch.
You may need .0002 accuracy but I sure as heckfire don't. So, don't take my word on them being matched.
 
For that price you could buy a bunch of sets of them and sort them to a specific size. Probably not the same quality as a Suburban Tool but they are blocks of metal.
Joe
 

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Three blocks would work for most anything.
Looks like sets of three are available if one can believe the ad. No experience with the product so can’t vouch for the quality.

-frank
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