People often hear about different types of Sanders and among them they may come across Pneumatic Sander and Air Sander terms. So many Pros in Sanding world use them interchangeably. To answer this question if both these terms are related to a single device, yes both of them are pointing to the same device.
Basically, here Pneumatic means usage of the air under pressure while sanding. These sanders are professional grade sanders.
Also, they are very lightweight, which is one of the reason you will not get tired easily and can work with it for longer durations.
Below is an example I took it from Amazon, by the way it has an affiliate link which will take you to Amazon if you wish to make a purchase.
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