skill level testing

When testing for a new skill level, can you use multiple unicycles or does it have to be all on the same one. Like using a 20" for some of the stunts and a 24" for the others?

According to the USA rules, it all has to be on one unicycle. I don’t know what the IUF regulations are on this.

Quoted from “10.3.1 General” of the official skill levels at: