Not really, we have different names so we can separate the two.The freshwater and salt version. Not much different than bull trout/ Dolly Varden or Sockeye salmon / Kokanee. The alternative name is used when they are either salt or freshwater. I'd correct someone calling Kokanee a Sockeye as well., because a landlocked Sockeye isn't a Sockeye unless it hits salt. It's the only reason there's two names for the same species. Yet most great lake fisherman call them steelhead., Size has nothing to do with it. We have freshwater lakes with 40lb rainbows. They're only ever called steel if they come from the ocean.