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Canada has a similar group:

https://digital.canada.ca/

USDS is modeled after Britain’s GDS.

As is Australia's. They've diverged a bit more now but when launched it was pretty much a colour change and switching some lions and unicorns for kangaroos and emus.

https://designsystem.gov.au/

Singapore: https://www.tech.gov.sg/

Australia: https://www.dta.gov.au/

An acquaintance worked as CTO of the DTA, and ultimately it was a joke. The skills were there, but the clout to bust through politics was not there, so nothing ever got done. He ended up leaving after less than a year.