Depends on the company. Since it is liability only, they are looking at what their exposure would be if it crashed, and since they aren't drone experts, they just consider all of them the same. To the insurance company, it is just another vehicle. When I add a second car to my business liability, I pay more, but since the insurance company has enough experience with cars, they know a F250 will do substantially more damage than a honda Civic. With drones, they don't know that yet. And if flying legally, the most frequent claim will be property damage, hitting a car, house, powerline, etc. And they will assume a Mini2 could take out a car paint job or roof just as fast as an M30, until enough covered accidents happen that they have statistics.
Skywatch.AI has 1M coverage for a little more, and it includes as many drones as you want, but only 1 pilot, and that's Drone GL only. With 2 drones and 1 pilot, I'd say Skywatch is cheaper for Drone GL only. This isn't business General Liability, just drone. But at the price you said, I would expect that you don't have "Business Insurance with a Drone Rider" but rather "Drone General Liability Insurance".
The specific type of insurance matters, which you didn't say. Does it cover employee fraud, loss of income, lawsuits from clients, and more? Or is it just Drone flight Insurance?