Similar but not the same. There is an insane variety of nearly identical MCUs, for example. For an otherwise identical part, you can often get it in half a dozen or more packages. (i.e. the chip has different physical form factors in terms of how it attaches to the PCB, pin type and spacing etc... but the actual die inside is the same) Then there are subtle variants for a given MCU (differing types/amounts/speeds of RAM/Flash/interfaces etc.) The matrix of variants quickly gets out of hand. It's probably easily 10-50x (depending on the part) the number of variants Intel/AMD come out with each year. The autos also typically use parts with an extended temperature range.