Updating Crystal Report assembly references in web.config

I'm working on cleaning a large older ASP.NET web forms application that uses Crystal Reports.  

My web.config adds a number of assemblies for CrystalDecisions.

<add assembly="CrystalDecisions.CrystalReports.Engine, Version=10.2.3600.0, Culture=neutral" />
<add assembly="CrystalDecisions.Enterprise.Framework, Version=10.2.3600.0, Culture=neutral" />
<add assembly="CrystalDecisions.Enterprise.InfoStore, Version=10.2.3600.0, Culture=neutral" />
<add assembly="CrystalDecisions.ReportAppServer.ClientDoc, Version=10.2.3600.0, Culture=neutral" />
<add assembly="CrystalDecisions.ReportSource, Version=10.2.3600.0, Culture=neutral" />
<add assembly="CrystalDecisions.Shared, Version=10.2.3600.0, Culture=neutral" />
<add assembly="CrystalDecisions.Web, Version=10.2.3600.0, Culture=neutral" />
<add assembly="CrystalDecisions.ReportAppServer.ClientDoc, Version=10.5.3700.0, Culture=neutral" />
<add assembly="CrystalDecisions.Enterprise.Framework, Version=10.5.3700.0, Culture=neutral" />
<add assembly="CrystalDecisions.Enterprise.InfoStore, Version=10.5.3700.0, Culture=neutral" />

However, I believe my app only imports CrystalDecisions.CrystalReports.Engine and CrystalDecisions.Shared.  If that's the case, I only need to include:

<add assembly="CrystalDecisions.CrystalReports.Engine, Version=10.2.3600.0, Culture=neutral" />
<add assembly="CrystalDecisions.Shared, Version=10.2.3600.0, Culture=neutral" />

Correct?

Also, what steps do I take to update the latest assembly version and is it backward compatible or will I need to update my code? 

Thanks in advance.