Yes. All of the Trick Shop and Concept Cast Control Knobs are interchangeable.
If you purchase the original Inception Cast Control Cap you will need the following parts:
to make your life really easy you can order any Trick Shop Cast Control Cap that starts with "TS3" they come in about 20 different colors. You don't need to order anything else, the washers are secured inside the cap assembly and cant be lost.
The new TS8-20TX looks amazing on the Inception. They are new and just came in. Your local 13 retailer can order it, or check tackle warehouse or Kabeles trading post(both great Trick Shop dealers). They should have them very soon, I think they shipped Friday last week to them?