Porting nRF9160 application to nRF9151

We have an application using nRF Connect SDK version 1.8.0 that runs on the nRF9160.  It is based on Asset Tracker v2, with the GPS tracking part remaining largely similar, and the cloud reporting part replaced by a custom communication with AWS.  What would be the typical effort involved in porting this application to the nRF9151?  Thanks.

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