Okay, just to break this Falcon thing down a bit...
In early in June we saw this:

Then in August we saw this:

Just my opinion of course, but I see no reason to presume that this
not an attempt to recreate this cockpit...

Of course, I can see
differences, but then there were differences between the interior, exterior sets and models used across the three OT movies to a greater or lesser extent.
So, early in September things got interesting when some guy filmed this by accident:

The important thing to note here is that pretty much half of the Falcon is constructed, the cockpit is attached,
and there is no radar dish present. The fact that the right facing edge of the left mandible is present would suggest to me that this set is built purely to be shot from the right-hand side.
Again, just my opinion, but the markings and details seem consistent with an attempt to recreate the OT Falcon faithfully.
What's interesting is that the pictures that surfaced later that month showed this:

Clearly the same set in the same location, but there is far less of it constructed - including the cockpit, which is detached. The curious thing, though, is that dish - it wasn't there earlier, but the rest of cockpit side was.
Again, having the dish there at all is consistent with the set only being required to be shot from one side, as is the fact that the scaffolding extends further to the left than the natural outline of the ship (which suggests that side was never built/shot at all).
So, presuming these photos were
taken in the same order, chronologically, that they leaked (they might
not have been, of course) you would presume that the earlier pic was the Falcon under construction, before the dish was put on, and the later pic was the set being dismantled after the dish was put on.
Maybe not. Either way, it
still looks to me to be an attempt to recreate this:
... for a shot which requires it to be filmed from one side in the background of a set.
Apart from the obvious difference, of the new dish.
And what I mean by that is, if you can see any
discrepancies in the "Carousel/Falcon" blueprint comparison thingy with regards to the mandibles and the smoothed out rear of the ship,
then they sure aren't actually there in this set anyway.
IMHO.
So, for me, it comes down to these:


Yeah, I can see why there is reason to think there
might be two ships here. Concept paintings and plans for the Falcon with a different dish to the one we've seen on set. A size comparison blueprint, with "differences".
Yet for me, it still seems
more logical that someone simply remembered the Falcon dish being lost in the second Death Star and thought it would be cool to make a visual nod to that
after those concept paintings were done. And that the different scaled sets are merely there because they have different purposes and requirements during the shoot.
It seems
less logical to me that anything I've seen leads to there being two almost identical ships - not forgetting of course this is one of the most iconic pieces of design in sci-fi - of slightly different sizes in this movie. Is the dish intended to be the only thing to tip the more casual viewer off as to what is going on here?
Just doesn't stack up for me...