Even if all parts of a die use the same transistor library, you'll still usually have lots of different clock domains so that different cores can run at differe

Even if all parts of a die use the same transistor library, you'll still usually have lots of different clock domains so that different cores can run at different speeds according to how busy they are. And you'll sometimes have a few cores that have been identified as capable of running one or two speed bins higher than the others, from ordinary variation. But there's probably also an example of some phone chip that has Cortex A53 cores implemented on two different transistor libraries to hit significantly different performance/power points.