In the photos above, the first is a 737-700, the second is a 777, and the third is a 737-800.
I think the comment about the similarities/common type with the 757/767 and the 737-800 was due to the overhead panel. Boeing planned on using an overhead panel which was very similar to the 757 style, however doing so would require 800 and 900 pilots to have a different type rating compared to the current one for the rest of the fleet. As of now, if you get a 737 type rating (say in a -300), you just need to complete differences training to be certified to fly the -700, -800 and -900.
I was at the CAL training center going through a short ground school and sim session on the 737-300 EFIS, and we were permitted to use the CAL computer based training (CBT) programs. It had the general aircraft systems for the -300, -500, and -300 EFIS. Then it had differences sections to learn how the -700, -800, and -900 differed from the rest of the fleet. There are some major differences, but there is also many similarities.
Most of the differences in the "Classic" model 737s and the "NG" model 737s are in automation and pilot displays.
The 767-400 cockpit is arranged simliar to the 777 cockpit displayed above. It has 5 CRT displays across the cockpit. It has the same overhead panel as the older 767s, however. It does not require a new type rating, but like the 737s, requires differences training.