If the U-joints are the same size, the yokes are likely interchangeable.

But, since the rear-most joint flexes more that the others, in some cars, the rear most U-joint is larger.

The first time I saw a professional mechanic hammering away at a U-joint to install the caps, I was horrified. I'd thought a press or even a vice was the way to go. Really though, you have no control over the press or vice, and no idea how much pressure is being applied, and it's pretty easy to bend the yoke. I've wasted a few. A soft hammer really is your friend. Much more control.

If the yoke is squeezed, you bet... that U-joint might get in there. But it's gonna wear way prematurely..

In any event, just measure the circle that bolts to the tranny and rear. If identical, the tranny side and diff side should interchange.

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-Matt I ♥ my ♂