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Comparing the two cameras it looks like all things being equal (Not knowing how your image train is built) that the 16200 has about 34mm back focus distance (I don't know if that includes an allowance for filters) and the 163C about 9.5 to the front face of the camera (They give 17.5 to the front face of the tapered mount flange)
Not knowing the direction of travel I cant suggest a step direction, but I would start by racking the focuser all the way in and work your way out from there. You might need to have the focuser racked in about 25mm from the position the 163C is in focus at.
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