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Yes, it is around that size and not really similar in sound since the strings are not in an ascending order like the ukulele.

The baritone uke is usually strung D-G-B-E like the highest 4 strings on a guitar.

Venezuelan Cuatro has some variations on tunings. The traditional one is A-D-F#-B (that B is in the same octave as the A), a guitar-like tuning G-C-E-A (taking on the ascending tuning pattern of many instruments), a tenor tuning E-A-C#-F#. And there are others. There's also the different kinds of cuatros with more strings and sizes, but those are only played on a specific region of Venezuela.