The short answer Tordon is yes. A B-737 type rating allows you to fly most (if not all) of the 737s. I say this because I thought the 737NG (Next Generation) required a separate type rating from the rest of the fleet. The Advisory Circular that lists the type ratings available and what they cover don't show a difference so according to this data one is good for all.
The significant differences which require different type ratings between airframes these days is usually avionics. The Falcon 2000 (DA-2000) and Falcon 2000 EX EASy (DA-2EASY) are an example of this where you'll find the same airframe with significant differences in avionics that a separate type rating was deemed necessary. Cessna Citation 500 series airplanes are covered by a CE-500 type. That means I can fly a Citation 500, 501, 550, 551, S550, Bravo, 560, Ultra and Encore under that one type rating. There are several generations of avionics differences between the earliest 500 and the off the line Encores. Despite having very similar systems and avionics to the Citation Ultra, the Citation Excel requires a separate type rating which is designated CE-560XL. That is just another example of how some seemingly minor differences from a pilot and systems stand point can require a new type rating. On the other hand the Boeing 757 and 767 share a common type rating so when you pass a checkride in one you automatically get one in the other. This happened with the Embraer 170 where I was issued an ERJ-190 rating in addition despite not doing any official training on the differences between the two types.
The differences between the 737's pictured as you pointed out are engines. While I can say the airplane with the Cigar Engines (earlier turbojets) is either a -100 or -200 I'm not sure of the external differences to tell them apart. If I knew how many windows there were supposed to be I guess that would be one way to tell. The airplane with the Turbofan engines (although these are still considered "turbojet" in the FAA's definition of how they differentiate jet and propeller airplanes) is probably a -300 but again I'm not totally sure because the only way I know to tell the difference is the -300 has 1 emergency exit over the wing, the -400 has two. It's a -300, 400 or 500. Based on its relative size I'd say it's a -300. Hope that helps more than hinders.
I didn't see the second photo earlier but it looks to be on purpose as opposed to a nifty angle. The first photo, while does look like the number 2 airplane is pitching out, could have been a parallel departure much like you see in Atlanta which prompted my earlier reply. Still, neat photos!
