New instance with same @@VERSION as existing instances I have a SQL Server 2008 R2 server with several instances installed. Is there a way to add a new instance and have it be to the same build as the existing (and updated / patched) instances?
No, unfortunately there is no magic "be like that guy" feature. What you have to do is either:


install RTM and then apply the SP + CU; or
slipstream the same SP + CU into the RTM binaries and install that. These instructions are applicable to both SQL Server 2008 and SQL Server 2008 R2, though the process is a little easier in SQL Server 2012.


The former is easier but could require more downtime.