I feel like I heard my wrong version in an article about EpiPens. Is it different for devices maybe?

the first generic EpiPens were just approved a month ago, I don't know if they're widely available yet. if for now some plan formularies only have name-brand injectors on them, some people with insurance could potentially pay less for the brand than the generic until that changes. otherwise, the same substitution allowances and requirements should apply.

EpiPens aren't really medical devices, it's just a drug with a specialized route of administration. it's not any different from an inhaler, a nasal spray bottle, an eyedrop bottle, etc., from a dispensing point of view.

EDIT: it's true that pharmacists aren't always allowed to tell patients when they could save money by buying a generic and paying out of pocket rather than buying a more expensive name brand and paying their share of the full price with insurance. that may be what you heard.