what did they change form 26.1 to 26.2

They mostly changed Liquid Glass controls, Lock Screen behavior, alarms/timers, Sleep Score, and a few Apple Music, Podcasts, and AirPods features from 26.1 to 26.2. iOS 26.2 also appears to include security fixes, while 26.1 was more about adding the initial set of usability toggles.

Main changes in 26.2

• A Liquid Glass slider for the Lock Screen clock.

• Sleep Score updates.

• The ability to set alarms for reminders.

• AirPods Live Translation in the EU.

• Apple Music improvements, including offline lyrics support.

• Reminder alarm support and Enhanced Safety Alerts improvements.

What 26.1 added

• A toggle to adjust Liquid Glass transparency.

• An option to turn off the Lock Screen swipe gesture for Camera access.

• A “slide to stop” control for alarms and timers to reduce accidental dismissals.

• New Apple Intelligence language support.

In plain terms

26.1 gave you more control over the look and feel of the interface, while 26.2 seems to refine those controls and add more convenience features. 26.2 also brought security-related fixes, so it was not just a cosmetic update.

TL;DR

26.1 = new toggles and usability changes.
26.2 = more fine-tuning, a few new features, and security fixes.