Hi,
It will be almost exactly the same, given the Scatters have the same options, and there are "a few" scatters. If you create too many (>100) scatter objects, of course giving away the usability, and have the same amount of instances in total, there will be performance decrease, as parsing much more unique objects will take more time.
For performance optimization, depending on the scene, viewing distance etc., you can get decent performance increase by using CoronaPattern as "base" for scatter, and having significantly less scattered instances. Distributing the total number of instances over multiple Scatter objects will more likely worsen the performance, and significantly affect the usability and control of all.