Hello brother!. Thank you for visiting my video, this week's theme inspired me a lot and brought out my best and most precious childhood memories, that's why I wanted to play with the editing... That's a good question hehe, for the moment I can tell you that the only difference I find between the ukulele and the cuatro is their tuning, besides the nation where each one comes from. The two inner strings of the Venezuelan Cuatro are sharp, and in Ukelele they are low. As there are several types of ukulele, there are several sizes too, but the soprano, despite being very small is just like the Cuatro, the tuning is A, D, F#, B. You are right, they are too similar and I had not thought about this hehe. They essentially the same.