The main difference between the SCD971/26 and SCD973/26 models lies in the advanced functions and technology. The SCD973/26 model offers additional functions such as sleep and breathing rate tracking with AI, cry interpretation and a higher Display resolution. It is also equipped with more advanced sensors and improved app integration, making it a more comprehensive monitoring system.

Here are some of the key differences:

- Display resolution and camera features: The SCD973/26 model has a higher display resolution and better camera features, resulting in a clearer image.
- Sleep and breathing rate tracking: Only the SCD973/26 model offers these functions with AI support.
- Cry interpretation: The SCD973/26 model can interpret cries to help parents better understand their baby's needs.
- App integration and functions: Both models use the Philips Avent Baby Monitor+ app, but the SCD973/26 model offers advanced functions such as a sleep dashboard and automated sleep diaries.