The Apple Watch SE 2024 and the Apple Watch SE 2023 have some important differences, although the basic functions remain similar.

## Hardware and processor
- The Apple Watch SE 2024 uses the S8 SiP with a 64-bit dual-core processor and a 2-core Neural Engine, which is a slight improvement over the S7 SiP in the SE 2023.

## Sensors
- The Apple Watch SE 2024 comes with the same sensors as the SE 2023, including the second-generation optical heart sensor, a compass, an always-on altimeter and others. However, there are no new sensors added, unlike the Apple Watch Series 10, which includes additional sensors such as a blood oxygen sensor and an electrical heart sensor.

## Display and design
- The display and design specifications of the Apple Watch SE 2024 remain essentially the same as the SE 2023, with a Retina LTPO OLED display and a maximum brightness of up to 1000 nits.

## Battery life and charging speed
- The battery life and charging speed of the Apple Watch SE 2024 are also identical to the SE 2023, with an everyday battery life of up to 18 hours and a charging time of around 1.5 hours to 80%.

## Software and functions
- Both models run on WatchOS and offer similar functions such as heart rate monitoring, sleep recording, pedometer and emergency call functions. There are no significant innovations in the software functions between the two models.

To summarise, the Apple Watch SE 2024 offers slight improvements in the hardware, but no significant innovations in the sensors or software compared to the Apple Watch SE 2023.