Not the same plant, but two completely different plants.

Expansion:

Fishy grass, formerly known as Houttuynia cordata also known as folding ear root, cut off the root, Hakka called the dog stick ear, in taxonomy belongs to the dicotyledonous plant Houttuynia cordata genus, with fishy odor herb. The stem is flat cylindrical, twisted, 20-35cm long, 0.2-0.3cm in diameter; the surface is brownish-yellow, with several longitudinal ribs, the nodes are obvious, and there are remnants of fibrous roots on the lower nodes; the texture is brittle and easy to break.

2. The root of leucaena leucocephala is the rhizome of the perennial herb leucaena leucocephala of the grass family. Harvested in spring and fall. Dry in the sun. Remove the fibrous roots and membranous leaf sheaths, cut into sections for raw use or fried charcoal. Alias: Thatched Root, Ground Pipe, Ru Root, Blue Root. Indications: Cooling blood to stop bleeding, clearing heat and removing toxins. It is used for vomiting blood, urinating blood, feverish gonorrhea, edema, jaundice, dysuria, fever and thirst, gastric fever, vomiting and retching, cough.