No, they aren't all the same. I'm not technical but the amperage can be different.
Original phones and devices were happy with 1.0A or less - I would think your fan would be delighted with this.
But newer phones (especially with quick charging) need 2.1A or above - I think some now run at 3A. They seem to discharge quicker than they charge if plugged into the older adapters!!
(Similarly, but not relevant to you, is that the cables are also different specs so you can have a fast charging socket but the cable may not be man enough so your device won't fast charge)
As I said, your fan will be OK with your original plug though.
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USB mains plugs new
USB mains plugs new