Are the steering boxes same on a 68 chevy c10 and c20?

No, the steering boxes are not the same on a 68 Chevy C10 and C20. The C10 has a lighter duty steering box than the C20, which is designed to handle the heavier weight of the C20. The C20 steering box is also larger and has more gears, which gives it a higher steering ratio and makes it easier to turn the wheels at low speeds.