Can one a requester in one account be a part of an approval process in another account?

Can one a requester in one account be a part of an approval process in another account?

I would like to set up a workflow wherein a requester in Company A submits a new hire hire form which requires sign off from an approver in Company B. Is this possible?

I know how to do this within one account using the Service Workflow settings but wanted to know if it was possible to set up cross-company approvals.
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