Not even close to the same thing. A company representing another companies work is much different compared to a companies name being used in a generic manner. Another relevant example would be saying Kleenex instead of tissues.
Anyway, this is basic stuff that even wiki has info for. Here is a list of goods that are no longer legally like protected like Xerox and Kleenex.
»en.wikipedia.org/wiki/List_of_ge ··· ademarks--