One of the issues in the US vs other countries is that the licenses for a lot of these sort of things are per state and the requirements vary drastically. There was an article here a while ago about a nurse who moved state, but had to transfer her qualification too which took about six months. In the UK nurses must register with the governing body, but any qualification from the EU is equally valid [0].

[0] https://www.healthcareers.nhs.uk/i-am/outside-uk/information...