My K20 Pro screen broke however I only see replacements for Mi 9T Pro

I would say yes, they are. If you look around at sites selling replacement screens, there's an Amazon seller who is offering a replacement screen that it says will work on the Redmi K20 and K20 Pro, as well as the Mi 9T and 9T Pro.

Amazon.com: Display for Xiaomi Mi 9T/Mi 9T Pro/Redmi K20/K20 Pro AMOLED Screen Replacement Touch Digitizer Assembly with Kit(Black) : Cell Phones & Accessories

In addition, if you look at the description for the Mi 9T Pro device page, you'll see the following quote:

Mi 9T Pro

Mid-range phone released September 2019. Alternatively named Redmi K20 Pro in China and India.

So yes, you should be good if you buy one for either phone; they're all the same. This guide should work to do the replacement too.

Xiaomi Mi 9T Pro Screen Replacement - iFixit Repair Guide