Yes, but quite a bit of tweaking is required to each of the Songs within the Osimo versions as the PA will make a best guess at the instrument sounds to use if the instrument sounds that are within the Songbook entry are not present in the PA you have.
That said, it is a simple matter to use the Songbook Editor software to combine all three Osimo versions into one Songbook file and the multiple Setlists that are related to the Osimo versions.
Not tried this as yet but in theory it is possible, in practice it may be quite a lot of work on the keyboard post merge correcting all the sounds, not sure how the Pads, the intros, fills, variations, endings etc will be affected.
As the weather is not supposed to be good over the next few days it has scuppered or plans so I can have a play combining them and see what happens, although it is likely that I will have more work to do than you since my PA is the lowly 700.
On a side issue I am hoping the Luke from Korg gets the Triton sounds sorted
BTW
For those reading this that are wondering what on earth I am blabbering on about I will explain. Korg UK have created a standalone set of customised Styles and saved each if them as a Songbook entry (Registrations) and then created Setlists related to the Songbook entries such as World of Bond (movie themes), Big Band etc. Korg Arrangers are based in Italy, the name Osimo comes from the town in Italy where Korg have their designers and developers based.