On Dev15 Preview 4, we see the following warning in the ActivityLog:
<entry>
<record>408</record>
<time>2016/07/15 01:05:06.532</time>
<type>Warning</type>
<source>VisualStudio</source>
<description>Found templates with duplicate template ids at "C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO 15.0\COMMON7\IDE\EXTENSIONS\QYV5J2JO.FAG\ProjectTemplates\JavaScript\Node.js\1033\Express4App\ExpressApp.vstemplate" and "C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO 15.0\COMMON7\IDE\EXTENSIONS\QYV5J2JO.FAG\ProjectTemplates\JavaScript\Node.js\1033\AzureExpress4App\ExpressApp.vstemplate"</description>
</entry>
<entry>
<record>409</record>
<time>2016/07/15 01:05:06.538</time>
<type>Warning</type>
<source>VisualStudio</source>
<description>Found templates with duplicate template ids at "C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO 15.0\COMMON7\IDE\EXTENSIONS\QYV5J2JO.FAG\ProjectTemplates\TypeScript\Node.js\1033\TypeScriptWebApp\NodejsWebApp.vstemplate" and "C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO 15.0\COMMON7\IDE\EXTENSIONS\QYV5J2JO.FAG\ProjectTemplates\TypeScript\Node.js\1033\TypeScriptAzureWebApp\TypeScriptWebApp.vstemplate"</description>
</entry>
<entry>
<record>410</record>
<time>2016/07/15 01:05:06.539</time>
<type>Warning</type>
<source>VisualStudio</source>
<description>Found templates with duplicate template ids at "C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO 15.0\COMMON7\IDE\EXTENSIONS\QYV5J2JO.FAG\ProjectTemplates\TypeScript\Node.js\1033\TypeScriptExpressApp\ExpressApp.vstemplate" and "C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO 15.0\COMMON7\IDE\EXTENSIONS\QYV5J2JO.FAG\ProjectTemplates\TypeScript\Node.js\1033\TypeScriptAzureExpressApp\TypeScriptExpressApp.vstemplate"</description>
</entry>
I confirmed that these templates have the same template Ids. I don't think this causes problems on VS2015.
On Dev15 Preview 4, we see the following warning in the ActivityLog:
I confirmed that these templates have the same template Ids. I don't think this causes problems on VS2015.