Use Professional Time for additional webdesign or re-design not covered in other products (new custom webdesign or big modifications).
Changes are small modifications on website configuration (change a font type, a text or a photo, change the background color, add or modify a link, menu changes, etc). Changes are different from Content Updates (which are just for adding content like text, images, or videos). You can use Professional Time to add 4 more changes if you need it.
If you need an additional Page (no Landpage) or Notifications setup, use one Time.