2 identical FP4's one is stuck at e os 1.21.1

I forgot to mention that the phone is encrypted. or at least the data folder is. Does that matter?

I noticed that the e/os [v1.21-r ] through [ [v1.21-t ] includes the [Android security patches] available until February 2024.

Anything later and the security patches have changed.

Would that pose an issue sideloading and preserving the data?