John… and perhaps AC 25 -7A “Flight Test Guide”, which although it is for transport category aircraft is
AFAIK the only guide to flight tests that is used across a range of aircraft categories.
A particular hazard of the Part 23 wording is that pilots whom move up to Part 25 aircraft from aircraft with lower standards might take their ‘lower’ understanding with them. I don’t recall any ‘differences’ training covering the certification standards when converting to larger aircraft.