Pass rates ATX variants

Looking at the pass rates for ATX, the performance seems to be slightly better in March and September than in June and December. Is ATX-UK (the only one examined in March and September, I believe?) “easier” than the other variants or is performance just slightly better in the UK?
Are the pass rates per variant published somewhere?

Exam session ATX
Sep-25 53
Jun-25 49
Mar-25 52
Dec-24 47
Sep-24 49
Jun-24 47
Mar-24 49
Dec-23 49
Sep-23 48
Jun-23 43
Mar-23 45

(source: https://www.accaglobal.com/ie/en/student/exam-support-resources/pass-rates-for-acca-qualifications.html)