Looking at 10’s advance schedule for this Saturday and it appears The Loop 400th episode is airing on the main channel from 9-11:40am with Studio 10: Saturday bumped to 10 Bold - which would explain why the 10 Peach logo wasn’t used on the above caps posted by @TV.Cynic.
From the guide:
The program’s 400th episode extravaganza! Join Scott Tweedie and Liv Phyland as they countdown the top 25 greatest songs of all time. Special guests are Dannii Minogue, Shannon Noll, and loads more.