French person here: there absolutely is a difference, at least in the "heard on TV" accent.

Could you be talking about the southern accent where maybe those sound similar?

A pet theory of mine is that people confusing "est" (sounds like "è", means "[he/she/it] is") and "et" (sounds like "é", means "and") while writing grew up with an accent that does not make the distinction between those sounds. (I don't criticize the mistake or the accent but have always been curious about this precise kind of writing mistake because those two words sound so different to me)