VS2008: MSI Deployment Project - How do I deploy a minor update leaving ProductCode unchanged?

Question

The following link refers to making a major change to the application and changing the ProductCode. http://stackoverflow.com/questions/3024753/installing-a-new-version-of-a-deployment-project-over-old-version

Is it possible to easily (with Visual Studio) make a small change to an application and then without changing the ProductCode guid, create an MSI installer package that will update the already installed application? I don't want the MSI to require a manual uninstall first.

I have looked into the following articles but it seems over complicated for what needs to happen:

Minor Upgrades

A small patching example

Thanks