Yup, 737 and 757 are the same tube with one big difference which helps immensely in perception and actual space up front.

The 757 retains its width and height all the way forward to the galley while the 737 is far narrower and shorter in the cockpit which translates into a significant taper. This makes the front of first class in the 737 narrower, the first class overhead bins smaller, and the ceiling lower at the front of the airplane. A roller board that only fits sideways in a bin at the front of a 737 has no issue on the 757. A pilot can immediately see the difference between 757 and 737 cockpits despite the same tube.

Step onto a 757 and it's a very different perception in the front of the cabin compared to the 737. Boeing knew this was an issue with their tube nearly 40 years ago and fixed it. But then they kept making 737s and the rest is history.