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Hi sir,

It would be better to use LP-MSPM0C1104 to develop MSPM0C1103.

But regarding to your situation, I think in some simple use case, LP-MSPM0L1306 can also cover the MSPM0C1103, but please note the difference peripherals and flash between these two devices. If you only use the common peripherals such as UART, TIMERG, etc., I think you can develop based on MSPM0L1306 first, and then change the device type in Sysconfig before transferring to MSPM0C1103.

Regards,

Zoey