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Hmm, no the two gears are not interchangeable. What is the size of your build plate? If the large gear doesn't fit on it you may also have trouble printing parts of the main assembly. The reason the 128 won't work out of the box in place of the 160 is that part of it functions as an axle and mates with the bearing. That bit is not present on SpurGearM1x128. You could meshmix this nob off of the large gear and add it to the small one. You'd also have to move the motor mount up to meet the now smaller gear. (Btw, it's also an option to just clip off one side of the gear since it's rarely desirable to rotate the axis a full 360 degrees, if your build plate is not a square)