If I buy CPUs for my server, do I have to buy a "matching pair"?

Scott Beeson asked:

Can I purchase two identical CPUs say from different websites? I was told they need to be a “matching pair” but I can’t find any evidence to support that. Will I encounter any problems from buying two individual CPUs that aren’t a “pair”?

In case it matters, this is the motherboard: https://www.supermicro.com/products/system/1u/1028/sys-1028gq-tr.cfm

My answer:

You need to buy two identical CPUs. That means they must be the same processor model and stepping. They do not have to be sold by the same vendor.

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