The tank tread details around the cockpit hatch are different pieces than the model you referenced, as they have a ridge in the middle and four links instead of three (one of them was filed on the edges and is nearest to the hatch). The boxy protrustion on the "forehead" doesn't have a hole (ejector pin mark?) in the middle and has hinges on the side, probably a hatch cover on a tank. There are also two small "L"-shaped greebles that flank the boxy protrusion that have holes in the top that are missing in the Round 2 kit. There are probably more examples besides that around the model, but these are the ones that stuck out to me, and I kind of want to buy two of these kits and convert one to a RotJ TIE Fighter having talked about this.
I definitely believe the TIE Interceptor was made from the same molds as the TIE Fighter, as the two examples in the photo set I have are basically identical.
I'm not faulting your research at all, btw! I'd rather you go off an ANH model for a model kit that is supposed to be an ANH TIE Fighter, and it's reassuring to know you specifically referenced a model from that movie.
I really appreciate your work! Sorry for assuming they used the CG asset for Rogue One; it's an easy assumption to make since it's a common thing in model manufacturing these days.