Confluence - Question about user tiers for different user numbers

Right now we are using a 10 user Confluence license and want to upgrade to 25 users. We would like to purchase draw.io. Is it possible to purchase a 10 user draw.io license? Only 2 users would work with diagrams and draw.io.

Hi, here I will explain to you how to determine your server pricing tier.

The add-on tier should match the licensed user tier of the Atlassian
host application. For example, if you have a Confluence Server license
for 25 users, you should purchase the 25-user tier for add-ons. Even if
fewer users want to use the add-on than your host application license,
the two licenses should match exactly.

Here the link to the pricing for draw.io on the Atlassian Marketplace: draw.io Diagrams & Whiteboards