The physical dimensions of the cherubim crafted for the Temple were designed with perfect symmetry. Every measurement of these figures was absolutely identical. Just as they shared the exact same width, they also matched perfectly in height, with the first cherub rising exactly ten cubits tall.
The primary approach among commentators is that this description serves to emphasize the absolute equality between the two figures. There was no variation in their size; the second cherub was an exact match to the first, reaching the exact same height of ten cubits.