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- Australia
Yes, I've been trying to put together a category lineage for WEC / Le Mans, and have come across a similar understanding.In fact Le Mans always complained to FIA rules, at least their regulations and car clisaffication, expect for some categories in 70-80's.
even since 1923 there was a tehcnical regulation from the ACO, not the former FIA name. you can find the regulations sometimes on the net, or on the FIA website, even for the very old one.
Sadly most of their time, the FIA tryed to kill Le Mans, and/or at least make them weaker than F1, and the ACO bosses alwyas wanted to keep the freedom of us form the FIA.
ACO added in 'Prototypes' in 1962, is my understanding, and GT from 1959. FIA brought in their "Groups" to essentially define the same categories in 1966, but ACO continued to categorise as Sportscars, Prototypes and GT until 1977 (I may be slightly out, but this is just what my research has been showing). From 1977, they essentially ran to the FIA Groups for a few years, before adding in GTP alongside Group 6 at around the same time Group C was about to start.
From what I've seen it looks like, to me at least, that 2004 is probably the year we can say FIA and ACO aligned finally (unofficially I guess) on categories - at this point having LMP1, LMP2, and LMGTS (which would essentially become GTE).



