I have a 1:50 track of ENQUÊTEURS ASSOCIÉS on a compilation: Les plus belles musiques de films de François de Roubaix, vol. 2 (track 10, Hortensia label)
Is that possibly one of the two tracks on the Universal France/EMARCY compilation?
Sorry for my late answer due to the fact I was away for a few days and couldn't log on. I confirm that the version you mean (also available on a double EMI Odéon anthology) is different from the one featured on this LP.
Regarding the comparison of Le Canal gelé from JEFF with Bernard Herrmann, I must say I never thought of it. Well, why not ? However, broadly speaking, I don't hold it appropriate to compare this kind of stuff with American scores. With FDR we are dealing with a typically European approach.