Yes, you can, but should you?
CDRH will say no if you ask it, but it's pretty commonly done (especially in press releases) and CDRH rarely goes out of its way to address it. Jaydub's experience is pretty typical. Picked up on an inspection, not because CDRH on the lookout, and then just "chided" and let go once it was changed.
It might get more attention if your competitors complain to CDRH about it.
If you have another issue that makes CDRH unhappy, it's unhappiness is likely to escalate if it finds you are also touting a cleared device as approved, And once you have its attention, it will probably notice.
Depending on how knowledgeable your customers are, it could also do your credibility some damage. I know I'm not impressed when I see a company do this. I tend to attribute it to ignorance, rather than to malice, but I'm not impressed by ignorant companies. In particular, I have found many physicians are keenly aware of the difference, so I wouldn't recommend making this mistake with them.