Why do similar Xpath constraints in the learning path look different?

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I’m going through the “Constrain Your Data Using XPath” learning path and I have a question related to this page. There are 2 steps where we write entity access constraints for users who submit vacation requests, and managers who approve them. These constraints are very similar but why in one case we start the expression from the module name [VacationManagement.VacationRequest_Submitter='[%CurrentUser%]'] and in another case from the entity name [VacationRequest.VacationRequest_Approver='[%CurrentUser%]'] ? 
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