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When activating, it will detect the key (subscription or OEM key etc) and do the necessary. The install base is mostly the same, and if it isn't, will download everything that's needed.
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rabpwh1000

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you will need to remove the current version of Office and then install the version your desire to use.
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Thanks everybody for your help
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I have a laptop with a preinstalled version of office 365 &nbsp;but it does not have a product licence key. Can I downgrade this to Office 2016 by simply putting a 2016 product key in or do I need to uninstall office 365 and do a fresh reinstall of Office 2016?
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I have a laptop with a preinstalled version of office 365  but it does not have a product licence key. Can I downgrade this to Office 2016 by simply putting a 2016 product key in or do I need to uninstall office 365 and do a fresh reinstall of Office 2016?

Downgrading Office 365 to Office 2016

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.

Microsoft Office

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.