I think they are calling out that while both are plant based, one is meant to emulate a hot dog and one is not. That middle one probably isn’t trying to be a hot dog, but its own thing.
Note the veggie dog looks like veggies and spices packed into a sausage shape, but with a texture that looks very different, that is the same size as the hot dog. The plant based dog looks like the hot dog in color and with a similar smooth looking texture.
The veggie dog reminds me of a brautworst, which is roughly the size of a hot dog, but with very different taste and texture.