If you look at the photo above, then apart from the obvious stuff like engine position and the empennage, it looks pretty much like a 737 Max. Cover up to the rear of the wing root and you would be pushed to spot the difference. Same fuselage, same flight deck exterior. It seems in 55 years that Boeing design has been incremental rather than substantive. Well done to the original 727 designer.
I wonder if any of the original 727 tooling is still in use at Renton on the Max.
Regarding whether this was the world's last pax flight with an FE, the examples returned of the B742 and the IL76 are, if I am not mistaken, all freighters now.