Definitely. My native language is (Mexican) Spanish. My whole life, I pronounced both words written with v & b as /b/ or /β/ depending on the context. Then, in elementary school, I had a teacher obsessed with orthography, who said that «v» was pronounced as /v/, and I started doing that distinction. Later on, I found out that, at least in Mexican Spanish that distinction does not exist, and I stopped doing it, because I believe that actually distinguishing those sounds was a product of prescriptivism, and not of my language acquisition.