Cascade and ladder completely different haircuts. The only similarities are strands of different lengths and versatility. For the rest, sheer differences from execution techniques to appearance.
Haircut ladder is absolutely not difficult, even a novice hairdresser can do, and to perform the cascade will undoubtedly need more strength and professionalism. The steps of the ladder smoothly flow into one another, without distinguishing clear boundaries, and in a cascade, these boundaries stand out specially.
In addition, the ladder is made only on the edges of the hair, thereby highlighting the beautiful contour, and the cascade spreads around the perimeter. Laying the ladder is quite quick and easy; it will take much more time and skill to lay the cascade.
In some photos, the differences are clearly visible, and in some of them there is almost no noticeable, since good styling works wonders. It would not have been all the same ladder and cascade is not the same, although both haircuts look great.