As Mickel originally asked:
What are the Hotchkiss H-39 and H-40 models?
I am left feeling that I have managed mostly to satisfy my own personal need to yammer away about French tanks, while HMSDidactic did a better job giving you what you were looking for ... so I suppose I should go back to your original question.
If you are asking specifically about the tanks in the GHQ online catalog (a reasonable interpretation of your question), I would suggest you consider the tanks thus:
GHQ #FR3 "Hotchkiss H-39" is a Hotchkiss H-39, just as advertised. It happens to be an H-39 with the short SA18 L21 gun. The visual identifiers are:
1) Three double-bogies per side, and driver's hatch on the right (left as you face the tank) identify it as a Hotchkiss design. The Renaut tanks had 2 1/2 double bogies per side, and the driver's hatch on the left (right as you face the tank).
2) The horizontal rear engine deck identifies it as an H-39. The H-35 had a sloping rear engine deck. If you compare the visual profile of the two Hotchkiss tanks, and the Hotchkiss vs. the Renaults, the H-35 stands out as visually quite distict in this regard. GHQ does not offer an H-35.
GHQ #FR9 "Hotchkiss H-40" is a Hotchkiss H-39 with the longer SA38 L33 gun. It has all the same visual identifiers as the H-39, but a longer barrel. One might choose to call it an H-40 if desired, I suppose. But I have never seen the term used by French histories.
GHQ #FR8 "Renault R-39" appears to be a Renault R-40. The term R-40 was used in some French histories to refer to the Renault tanks when they were upgraded to the SA38 L33 gun. This may be one reason to refer to an upgunned H-39 as an H-40. But some other sources refer to upgunned R-35s as just improved R-35s (I believe they refer to the same tank.) This tank was actually pretty rare, as Hotchkiss production was given priority for the SA38 guns. The online catalog photo shows the visual identifiers of the Renault tanks to good effect. 2 1/2 double bogies per side, and the driver's hatch on the left (right as you face the tank).
GHQ #FR5 "Renault R-35" listed in the catalog is, I believe, a Renault R-35. That is to say, if you order #FR5, I believe you get R-35s. I have some GHQ R-35s. They are quite nice models. I believe they are #FR5s. BUT ... the photo on the web catalog shows H-39s, NOT R-35s. The bogies and the driver's hatches are visible. It is an understandable mistake to make, as these are very small tanks, the turrets are identical, and the general shape of the hulls is very similar. But it looks like someone goofed on judging what they had in the picture.
HMSDipotasiumphosphate and I hashed this through together some time last year, and I believe this was the conclusion we came to at that time.