Powerstroke starters are designed for a 17:1 engine, IDI starters for a 21:1 engine, so they should be able to turn over the powerstroke with more ease (which should make it turn over faster).
Drama
I had reiterated this a number of times in this thread.
Again the OP did not come out with ALL this information in the beginning and kept the important data to himself.
Makes sense on a parts manufacturer point of view IMHO, as a simple spacer is cheaper than a whole new housing thus making a single replacement starter fit two different applications
How unfortunate this has gone Soooo Sideways....
Calling the OP a Troll is just not helping and not the OB way, he felt he had something to add and worthy of posting. To that we questioned this information and not once until after the explosive responses did the OP mention this elusive spacer.
To that I suggest that the OP go back over the thread and re read it looking at each post and determining where he missed the boat by not including all the info.
It's one thing to say this fits that....indeed it may, but if you do not include all the info to prove it thinking a spacer or shorter bolts or what ever is important, you are doing a DISS SERVICE to the community by providing flawed data for people to go on.
This then creates situations like some other person reads this info and suddenly finds a PS starter in piknpull for 10 bucks ...installs it and causes damage cause it's the wrong part!
Again all we wanted where the facts that the OP failed to provide.
Everyone, it appears the OP has an IDIstroke starter that has dual fit capability. As such nifty but next time, make sure you tell the whole story in full detail.