According to this Tom's Hardware article on the new ThreadRipper Pro it uses a different socket than the Treadripper consumer processors. Even though the Sockets are identical the pins designations are slightly different: https://www.tomshardware.com/reviews/amd-threadripper-pro-3995wx-review
AMD Threadripper Pro Specifications
The Threadripper Pro chips come with the 'WX' suffix to denote they are designed specifically for the professional workstation market and drop into specialized single-socket WRX80 motherboards featuring the sWRX8 socket. The LGA4094 socket is physically identical to the Threadripper consumer and EPYC data center platforms. Still, it features different pin assignments: AMD enabled some pins to support more memory channels and PCIe lanes than are available on the Threadripper consumer chips, and disabled certain pins used to support multiple sockets on EPYC platforms. The chips feature the same internal chiplet-based architecture as the desktop variants, albeit with a fully-enabled I/O Die (IOD) that activates the extra PCIe lanes and two additional dual-channel memory controllers.
So you would need to purchase a Motherboard with a sWRX8 Socket.
This tech site lists some of the new motherboards that has the new xWRX8 Sockets: https://www.anandtech.com/show/16396/the-amd-wrx80-chipset-a-few-boards-for-3rd-gen-threadripper-pro
The Asus Motherboard for the ThreadRipper Pro, in the above link, doesn't list any consumer ThreadRippers as being compatible only the Pro versions.
