It is not the same as a military dictatorship, as in a stratocracy the military's political power is entrenched and supported by the society and a stratocracy does not have to be autocratic by nature in order to preserve its right to rule.
It is not the same as a military dictatorship where the military's political power is not enforced or even supported by other laws. As such a stratocracy does not have to be autocratic by nature in order to preserve its right to rule.