These are "Horse attached series" FN114, I think mostly original, but some are a bit smaller and have less detail, so possibly 2nd gen castings?
I must say, I prefer painting the "Dismountable" series, these OPC's were a bit fiddly.
When I was deciding which regiment to paint, I considered the "Hussars of Conflans" as featured in Sir Arthur Conan Doyle's "Brigadier Gerard" stories, but minimal research was enough to show that they were an ancien régime unit, recruited in the Rhine Palatinate from German speakers, and they switched sides early on in the French revolutionary wars, so they were ruled out. ACD was a great story-teller but not a first-rate historical source.
I then thought, why not go with the 3rd Hussars, as featured in the Ridley Scott film "The Duellists"? The hero, Armand d'Hubert is an officer in the 3rd at the start of the story. Funckens describes the uniform as Sky Blue, but the illustration looks like a darker hue. In the movie d'Hubert (played by Keith Carradine) is shown wearing a uniform more closely resembling silver grey, so I was now getting confused.
But having got the idea of a sky-blue uniform in my head I decided to go with the 1st Hussars, as depicted in Funckens.