https://www.cnet.com/news/5000-imac-battle-imac-pro-vs-imac-2019/

The iMac Pro has two more USB-C ports than a standard iMac, a 10Gb Ethernet connection and an SD card slot that can be used with UHS-II cards. It's also designed to handle faster (i.e., hotter-running) components, with extra ventilation at the bottom.

You might think that the iMac Pro has some other important differences from the iMac, and you'd be right: