Hello,
the changes are not that minimal, depending if you simply want to get your project running in MCUXpresso IDE or if you want to switch to the MCUXpresso SDK. The SDK is fundamentally different from the drivers you probably have used in CW 10.6. If you have used Processor Expert for your CW project, it would be possible to run that in MCUXPresso IDE too, but I recommend that you should switch to the new MCUXpresso Configuration tools instead.
If you want to port you a Processor Expert project, you might have a look at the following article: Porting Processor Expert Projects to MCUXpresso IDE | MCU on Eclipse. This basically moves over your files from the CW project to a new project in MCUXpresso IDE.
Migrating your project to a MCUXpresso SDK project is not straight forward (depending on your application and what kind of drivers you are using), but longer term this would be the way to go.
I hope this helps,
Erich