The difference is being sent on TDY and being asked to jumpseat to work instead of a company purchased ticket. Further for example if you are based in DFW and the company wants to send you to LAX to pick up a plane they will positive space you to do it. They do not ask you to jumpseat on your own to pick up a plane.
In my early freight dog days I was asked to jumpseat for work all the time.
Thanks, that sums it up perfectly.