Hi,
That is right there is an update for Sample Code Package. This update has support for CW projects, you can find there the platinum project which handles a variety of modules for KL25Z. Most of the examples that you can find in recent update are only compiled for IAR but we are working to migrate them to CW :smileywink:.
There is a drivers folder: ....\KL25\kl25_sc\klxx-sc-baremetal\src\drivers. This contain peripherals code, such as initialization, functions and more for some modules. You can add this to your project, the only thing that you will need to do is to add the paths of the files in project´s properties.
Probably when you compile your project, you will find some issues with register´s masks, because some masks has not the same name in the different IDEs. You will be able to fix them easy because names are very similar.
Hope this helps.
Regards.