sharepoint server – Custom Solutions Upgrade is required from SP 2013 to SP 2016?

Hai have SharePoint 2013 Content database required to upgrade to SharePoint 2016,
I started now the Test Upgrade https://docs.microsoft.com/en-us/sharepoint/upgrade-and-update/upgrade-content-databases

SP 2013 Farm has deployed Custom Solutions that was targeted to .Net Framework 4.5 my question is when i take backup and deploy in Test SP 2016 farm is these farm solutions works?
or
Sp2013 Solutions is required to upgrade that SharePoint 2016 built on Microsoft .NET Framework version 4.6?