Yes use their guitars, as it's one of the most important part in their tone (guitar - amp interaction) .
I've been profiling like a mad man for the last two weeks on 4 types of guitars and figured out that - given a single tone - I needed to profile 4 times since the sweet spots on the amp where not exactly the same.
Please note in the comments/tags which type of guitar was used at profiling and the type of pickups used.