From a graphics performance point of view, the Mac mini (M1, 2020) is roughly equivalent to a Mac Pro (D700, 2013). This is single GPU performance. The second D700 in the Mac Pro is just having a rest.
https://browser.geekbench.com/v6/compute/compare/54989?baseline=6183019
No, I didn’t just get a lovely Mac Pro off eBay. Promise. 🤞