In strict terms, the first is a reminder and the second is an email.
A: "Do you need to send any more emails, or can we go to lunch?
B: "I have a few reminder emails to send for next week's meeting. Then I'll be ready."
A: "Have you sent out all the reminders for next week's meeting?"
B: "Mostly. I just have a few email reminders to send, then we can go to lunch."
By the time they get sent, they'll be the same thing, and no one's going to make a fuss about it. But you did ask.