"Yep need to cut both pieces and the easy way is with a chop saw. BTDT many times over the years"
Many versions of modern shielded PTO drivelines do NOT lend themselves to being cut so easily because the outer tube is ROUND and has a short square, rectangular or splined "sleeve" welded at it's end that mated with the other half of the driveshaft.
The "sleeve" may also have a bearing groove for a nylon ring that acts as a bearing for the free-rotating driveline shield.
If these HAVE to be cut, the tube has to be cut off where it is welded to the yoke, then be shortened on that end.
BT,DT. It's nice to have a big lathe, sometimes!