S3 region vs. Discourse region

Does the Discourse region need to be set to the same region as that of the S3 buckets?

What is the mapping between S3 regions, and Discourse regions? Could Discourse simply use the same set of names that S3 uses, i.e.

US Standard
Oregon
Northern California
Ireland
Singapore
Tokyo
Sydney
Sao Paulo
Frankfurt
Seoul

Discourse has ap-northeast-1, ap-southeast-1, ap-southeast-2, us-gov-west-1 right now, which to me at least, is unnecessarily confusing. I actually can’t fathom what us-gov-west-1 might correspond to, or whether Ireland and Frankfurt are both eu-west-1 or something else. Am I missing something here? Is there a good reason for using those names instead of the S3 city/region names?

Here’s another user wondering why these are named differently.