License Upgrade Pro-Rate?

If we purchase a Professional commercial license and then determine a month later we need to upgrade to a Team commercial license would we pay a pro-rated rate (2,000 - 700 = 1,300) or would we have to pay the full 2,000 rate to upgrade?

Found my answer on the FAQ of the pricing page:

What if I outgrow my edition and need to upgrade?
You can use our upgrade and renew form to pay the difference and upgrade to the new edition.