Hi @Chenxu1
1. Can S32K324 and S32K344 be obtained from each other by decoupling and locking steps? (mass production phase)
It is not possible because the production MCU comes with this feature locked.
2. Can the project be downloaded from S32K324 to S32K344?
It is not possible because there are several settings made in the project that will cause failures on other devices different than the version for which the project was created. I am afraid that the most viable option is to generate a new project with the corresponding MCU and then copy the application source files from your pre-existing project as well as any customizations you made to the project properties.
BR, VaneB