AMD CPUs have pretty small numbers for that, e.g. 100-000000651 or 100-000000789. They almost look wrong with so many zeroes. Zen/+/2 parts have part numbers like YD160XBCM6IAE (which is similar to the part numbers of much older AMD CPUs, which is apparently the AMD Ordering Part Number, OPN, scheme, and every digit codes information about the CPU). Zen 3 started with the new scheme, which just seem to be sequential development numbers. E.g. 3800X is 100-000000022. Here's a list: https://mkdev.info/?p=1245