Ive notived that xymon servers report memory usage differently across versions

eg 4.3.12 reports on physical, swap 4.3.17 reports on physical, actual, swap4.3.28 reports on real/physical, actual/virtual, swap/page 4.3.30 reports on physical:, virtual:, page:

Are these simple differences between versions or is there some configuration Ive not come across before that is determining these ? didds