Link: https://www.youtube.com/watch?v=OHB8woRoEuM

People still argue on team liquid whether all workers mine at the same speed, so I literally just tried it instead of theorycrafting

TL;DW:

When mining to a Nexus, Probes, Drones, and SCVs all exhibit the same mining rate, taking approximately 149 frames per cycle. However, when mining to a Hatchery or Command Center, all worker types experience a slowdown, resulting in a longer cycle time, averaging around 170 frames. Mining rate is determined by the structure the worker returns to, not the specific worker unit itself.

I didn't test hatchery in the video, but that exact patch can also do 149 frames, you just have to do a set up for it (but it automatically stays at 149)