Here’s some comparison:

• In both USA and china you can’t buy a ticket to a fast train if you’re credit score is bad. In china there is direct ban, in USA there is no fast Train.
• In china, this also applies to flight tickets. Basically if you have bad social credit, you are kinda fucked in almost anything in china including apointment to government services. USA it’s mostly tied to taking new loans or getting a new house or renting an apartment (?). Does not have actual effect on your ability to purchase flight tickets.
• In China they can check your phone (for images) and your online activity is quite accessible to the government. The checks can happen not only in international borders but also in inter regional borders. In USA, i know it’s a thing for foreigners during entrance to USA, not sure how is it for the citizens.
• In China you have to give away all your data (as a company), regardless of where that data is stored, if the government or the communist party requests it. They are technically different entities but practically the same entity. Failure to do so will fuck up your social credit. In USA you also have to hand over all your data (as a company) if the government asks regardless of where it is stored (since the CLOUD act), but hey at least you’re not handing over to the commies and it will probably not have any effect on your credit score.
• In china there is an app that notifies people of other people with poor social credit so they can generally avoid them. USA hasn’t invented that YET, although people from other political party are usually considered subhuman and beneath themselves and someone is looking.