No, but they are related. Link to Windows (formerly called Your Phone Companion) is the mobile companion app for Microsoft Phone Link (formerly called the Your Phone app).

Microsoft has started testing some improvements to its Phone Link app for iPhone users. Windows Insiders can now try out a new way to share a file from an iPhone to a PC and vice versa ...

For those unfamiliar, Phone Link is a Windows app from Microsoft that lets users connect their phone, whether iOS or Android, to their PC wirelessly. Once paired, users can see their notifications ...