So a quick search reveals that it is indeed true.
Hops are a type of bine and even within bines:
some bines always twine clockwise, including runner bean (Phaseolus coccineus) and bindweed (Convolvulus species), while others twine anticlockwise, including French bean (Phaseolus vulgaris) and climbing honeysuckles (Lonicera species).
So it is species-specific amongst bines. There is even apparently a Flanders and Swann song about the difference.