Why is Soft Q Learning not an Actor Critic method?

I've been reading these two papers from Haarnoja et. al.: Soft Actor-Critic: Off-Policy Maximum Entropy Deep Reinforcement Learning with a Stochastic Actor Reinforcement Learning with Deep Energy-Based Policies As far as I can tell, Soft Q-Learning (SQL) and SAC appear very similar. Why is SQL not considered an Actor-Critic method, even though it has an action value network (critic?) and policy network (actor?)? I also cannot seem to find a consensus on the exact definition of an Actor-Critic method.