One Service acct with permission with multi-region buckets

Question

I would like to know if I can create a single AWS S3 service account that has permission to read/write buckets from multi-region.

Or there is a restriction only on one region only.

Example

bucket-A (us-east-1)

bucket-B (us-west-1)

Permission-1 to access bucket-A and bucket-B

Service-acct-1 with Permission-1.

That means a single credential to access buckets from 2 regions.

Of course, I have to specify a different region when I access the bucket. Just with the same credential.