If it is a D1102 or D1102A it should be the same pump as the D1302A.
Now if it's a D1102AE, or a D1302AE or a D1302DI-A, then the pumps are different.
Make sure you save all the shims off of the original pump and reuse them on the new pump to keep the timing the same.
Why do you need to change the pump?