Wich ESC for my Quanum Reelentless

Hello. I am from Germany. My English is not so good.
The ESC from my Boat Relentless doesnt funktion.
Now i want to buy a new ESC for the Boat.
But i dont know wich one ?
I have bought a Hobbking 90 A ESC but it doenst fuctions, at the outrunner motor of my boat. but it function in my turnigy sct car with the innrunner motor.
Please help me an tell me wich ESC do i need for that boat, wich one is similar to the original from the relentless.

Thank you