Full Idea
It is a mistake to call bogus Cambridge changes 'relational changes', since there are real relational changes, such as the changes in the relative positions and distances of several bodies.
Clarification
'Cambridge changes' are when a remote and irrelevant change occurs
Gist of Idea
There are real relational changes, as well as bogus 'Cambridge changes'
Source
Peter Simons (Parts [1987], 4.1)
Book Reference
Simons,Peter: 'Parts: a Study in Ontology' [OUP 1987], p.136
A Reaction
I'm not sure how you distinguish the two. If we swap seats, that is a real change. If everyone moves away from where I am sitting, is that real or Cambridge? If I notice, I might be upset, but suppose I don't notice? Nothing about me changes.