The basic process is the same. What I don’t know is what they use for larger particles - huge kanuma or something like hyuga.
Azalea roots are much finer than pine roots so I don’t know if there are any special considerations to keep roots from drying out between the larger particles. I haven’t done this with azaleas so I don’t have good starting tips. Will ask if I get the chance to visit or speak with a grower.