Read & Write to 2 different S3 buckets

Hi, I have a collaboration where data is in an s3 bucket in the collaborator’s account. They have provided a set of read-only keys for us to mount the bucket. I want to run my analysis on this data and write results back to our own bucket with a different set of keys. We cannot find a way to setup 2 sets of s3 keys. We see a way to only store 1 set of keys. The difficulty is that we’re not using AWS s3 natively but via NetApp storagegrid so AWS IAM won’t work for us.