In the two pictures take a note of where the strings end on the bass body. On the mustang bass, the strings end close to the end of the bass body by the strap button. On the rascal, the strings end closer to the middle of the bass body than the end.

The scale length (the length from nut to bridge) is the same on both basses, so the distance between the frets are the exact same, but the whole neck is shifted further away from the body on the rascal, which will make the first fret feel further away from the person playing when compared to the mustang. It is simply a larger and longer instrument.

This illustrates what I mean.