It'll still work as a spare prop (You'll have to put it in reverse to go forward), but certainly isn't the best choice for that. Figure that you can get $200 if it's an old cast prop, $300 if it's a new CNC prop, on the open market.
Whether it'll fit on your PS190 is a different question - if it's a powerslot, you'll have a 1-1/8" propshaft, and if not you'll have a 1" propshaft. They need different props.
1998 Maristar 200VRS