Let's think about this for a second.
I'm going to see if I can break the idea of consumerism and materialism being inextriably linked and if I can do so without obsessing over their exact definitons.
Can I think of a person who is consumerist but not necessarily materialist?
Well I do see religious supply stores, as well as spiritualist supply stores. Selling things like candles, jewelry, books, rocks. A frequenter of these could be a consumerist that is not principally materialist.
Can I think of a person that is materialist but not consumerist?
There are the kind of hippies and/or hipsters that idealize such things as tiny homes, minimalism, living in a van. They do this typically not for religious or spiritualist reasons (some exceptions), but more because they lean against extinction rebellion kind of worldview. They think the resources and renewability of earth are running out. They have a materialist world view, without being consumerist. Thinking about these two type of people tells me that despite the strong bond between the two where one easily leads to the other, I don't think they're inextrectable from each other.
Definitely not the same thing.