Overall sounds relatively small fry:
The first proceeding targets iOS functionalities predominantly used by connected devices such as smartwatches, headphones, and virtual reality headsets. The EU intends to specify how Apple should provide effective interoperability with features like notifications, device pairing, and connectivity.
The second proceeding examines the transparency, timeliness, and fairness of Apple's process for handling interoperability requests from developers and third parties for iOS and iPadOS.
Essentially ensuring 3rd party connected devices have equal connectivity (which most do via bluetooth and Apps already), and ensuring startups can integrate.
Unless I'm reading this wrong? - can't see Apple leaving the EU over this.