Ball and trunnion to u-joint conversion?

The '66 driveshaft won't match up with the flange on the back of the '65 transmission.

Hmmm. I wasn’t aware of that. I’ll have to double check. I have a 3 SPD column shift and both look identical except the ball and trunion. I’ll slap it in the car and see. Have to switch out k frame and engine and trans has to come out. Was under the impression that they could swap out