No, a transmission from a 2000-2005 Dodge Ram 2500 will almost certainly
not fit a 2002 Dodge Ram 1500. While they might share some superficial similarities, the 2500 is a heavier-duty truck designed for significantly more towing and hauling capacity. This difference translates to a much more robust transmission in the 2500. The bellhousing bolt pattern, output shaft, and even the overall case size are likely different, preventing a direct swap. You would need more than just a transmission swap; significant modifications would be needed, and it would likely not be a cost-effective solution.
It's best to stick with a transmission designed specifically for the 2002 Ram 1500.
