You have to change the trigger bar and maybe a couple other small parts to make it work. If you look at the old manuals for each Ruger includes an exploded view to compare.
I used to tinker on the P-series a lot and swapped just about everything. Even made a P95 into a DC unit but had to mod the frame for the trigger bar to make it work. Also took a 89DAO and made it into a 89DA unit. Took a bit of grinding on the slide to fit a spurred hammer in but it was a fun project.
Been a long time but I think the big deal is the trigger bar.
Good luck and keep the P-guns alive!!!