This is a “Model Code” to “Model Code” comparison between the motors that Tohatsu builds for Mercury and Evinrude. Comparable models in the 2.5 hp to 6 hp range are identical between all three brands. There are some differences in the 8HP and larger outboards:

Mercury utilizes the 15/20HP swivel bracket on their 8HP and 9.9HP engines.
Mercury has the shifter in the throttle arm while Tohatsu and Evinrude have the shifter as a separate lever on the front of the engine (which is beneficial to the Novice user).

For your convenience we have also listed the comparable/similar model codes for Honda, Suzuki and Yamaha (which Tohatsu does not manufacture).