Only vSphere 6.7 training meets the requirement for VCP-DCV 2020.
If you look at this page you'll see the 3 requirements (6.7 training and 2 x 6.7 exams)
As you completed a 6.5 class there is an option that allows you to take a shorter What's New class for 6.7 - you'll see that as path 1.1.5 on this page.
