Ring of Water Walking:
While wearing this ring, you can stand on and move across any liquid surface as if it were solid ground.
Water Walk (Spell, emphasis mine):
This spell grants the ability to move across any liquid surface -such as water, acid, mud, snow, quicksand, or lava- as if it were harmless solid ground (creatures crossing molten lava can still take damage from the heat).
Since the Water Walk spell states that it renders acid as a harmless solid surface and the ring does not, can I deduce that I will take acid damage if I walk on an acid pool with the ring?