Yes, the level of government training differs not only in every school and state, but in every country. I'm not very much into the details, but I can say for sure that Justin did not get the push and years of experience that Khabib received.
There is no doubt that Justin is a pretty dangerous opponent. But a lot of people don't really understand the kind of pressure Khabib is under, which is why he takes his training very seriously. I'm talking about psychological pressure from my father or even the president (when he is hinted that he is the face of the nation).
I am very sorry for Justin and he will never be the same after this fight. Imagine how he will feel after round 1, when he realizes that he is years behind the other guy in the cage ... However, I will still root for Gaethje. Since after UFC229 I stopped liking Khabib (namely the incident with his friends). First they attacked Connor after sparring, and then they pounced on the bus (throwing bottles on the bus shouting "We'll fuck your mom").