It depends, over time I’ve learned to gauge how I feel and not rely on pace. How did you feel during and at the end of the 10k training run…totally knackered? Then that’s your 1hr RPE8 effort. Your pace will change depending on the route, weather, season, I’ll ess, etc.
If you felt like you could do another 10k, it’s more like RPE6 or even 4.
On the whole, most people should run slower than they do. At least, that’s what I hear repeated over and over by almost every training source.