I'm not an expert painter, and have a 32" DeAgostini Falcon unbuilt and a yet-to-be-completed 5-footer, so please take my opinion with a grain of salt, as I have painted exactly neither of them.
First off, your model looks really good, and I wouldn't overdo it or overthink it, as I think the two models really are VERY different in painted appearance. It may be as simple as the filmed lighting conditions of the two films that make them appear "similar" on screen when they are so different in static shots or up close.
To my (amateur) eye, the thing that always sticks out to me is that the 32" ESB Falcon always looks too "soft pastel" compared to the 5-Foot ANH Falcon, which looks much more stark in color scheme and color contrast. It almost strikes me as a "feminine" (ESB Falcon) vs a more "masculine" (ANH Falcon) approach to the painting of the two models. Another analogy I think of is that the ESB smaller Falcon looks like an Easter egg decoration while the larger ANH Falcon looks like a beat-up car from American Graffiti. I don't know the solution, but I do agree with you that the base coat is key, and for the 5-footer at least, that base coat is still something of a mystery in that no one has definitively (to my knowledge) ever produced "proof" of which color (or combination) was used to lay down the first base coat of white on top of the matt black primer on the ANH Falcon. We know they used Floquil railroad colors, and those colors are fairly well known and readily available either used (NOS bottles on Ebay) or in modern reproduction, but what you use for the base coat seems to make a big difference.
The banned user "Akumazeto" was my favorite RPFer when it came to imitating ILM paint jobs, so if you can find him (or his old threads/posts) he or his images might be of use.
First off, your model looks really good, and I wouldn't overdo it or overthink it, as I think the two models really are VERY different in painted appearance. It may be as simple as the filmed lighting conditions of the two films that make them appear "similar" on screen when they are so different in static shots or up close.
To my (amateur) eye, the thing that always sticks out to me is that the 32" ESB Falcon always looks too "soft pastel" compared to the 5-Foot ANH Falcon, which looks much more stark in color scheme and color contrast. It almost strikes me as a "feminine" (ESB Falcon) vs a more "masculine" (ANH Falcon) approach to the painting of the two models. Another analogy I think of is that the ESB smaller Falcon looks like an Easter egg decoration while the larger ANH Falcon looks like a beat-up car from American Graffiti. I don't know the solution, but I do agree with you that the base coat is key, and for the 5-footer at least, that base coat is still something of a mystery in that no one has definitively (to my knowledge) ever produced "proof" of which color (or combination) was used to lay down the first base coat of white on top of the matt black primer on the ANH Falcon. We know they used Floquil railroad colors, and those colors are fairly well known and readily available either used (NOS bottles on Ebay) or in modern reproduction, but what you use for the base coat seems to make a big difference.
The banned user "Akumazeto" was my favorite RPFer when it came to imitating ILM paint jobs, so if you can find him (or his old threads/posts) he or his images might be of use.