These are the same. The torque converter goes onto the input shaft and the input shaft goes into the oil pump of the unit and there is a seal between the converter and oil pump. This can be changed if you have the unit out but it only requires changing when it is leaking. Basically people think that if they have the unit out and don't change it that it will leak soon after.
If it were me, I wouldn't change it but you can't make a wrong decision.
Monday, December 2nd, 2019 AT 8:07 PM