I’m more inclined to think that the ‘package’ dictates the name rather than changes the name of the razor. After all, if you took the different razors out and shuffled them blindfold, you would not know which ones went with which set. I believe there were two versions of the Streamline - the earlier has a slimmer neck on the handle and different drainage channels in the base plate and dated from the 1930s with the changes introduced in the 1940/50s. If I can find them I have a couple of photos that show the differences.