I agree with TriStar500, with N949WP and Dnalor.
I saw a video about the history of the 747 from “before” the beginning. Actually, all the things said here are true:
The 743 is able for more pax than the 742.
But the extra weight makes it shorter able.
Actually, the 743 was, somehow (and with no offence intended) a kind of “bluff 742C”, after the 742B had done well. This is what the video explains. It is Made in U.S. and has the explanations of the man who “created” the 747 idea as widebody, as double-decker, etc. (Can't remember his name now)
The product 744 was made under the pressures of the companies wanting to “improve” the 742B in BOTH pax capacity and range.
Finally, altough the 744 is bigger and can carry more pax to longer distance, its “clear” weight is lower than that of the 743. (NOT the MTOW, which is quite higher -400 MTons-)