They would have been Saudis property but I no longer see that. Now, these Mirages belongs to EAF as far as I know. Even if it was Saudi's money, that will like a loan however, KSA may have a say into deal, if comes to fruition because we don't know anything about it currently. Secondly, if these C-130s were carrying something related to EAF Mirages for PAF then most probably they are spares or cannibalized birds going to be used for spares. The operational ones can fly to Pakistan or be through Ship otherwise, the such number of ACs will take too long to be transferred through Air like this.
If EAF's Mirages are supposed to fly all the way to Pakistan; I am sure we will be seeing a lot of photos by enthusiasts or deliberate marketing to send a message. Depends upon fairy range & flight time.
All in all, I will repeat again that nothing is clear as of yet. What if in the end it may turn out like C-130s were here to pick medical supplies along with some trainers for EAF. Never to hold high hopes so in the end may not be disappointed.