Hello. Converting an Audya (.PAT) style to (.KST) for Event it is not done by simple renaming as is the case with the new type Ketron (.KST) Style.
The conversion is done onboard the Event. To convert it you have to copy the .PAT style into a User Styles folder of the Event and then press MEDIA, find the .PAT style you copied and click on it and after clicking it you will be asked if you want to convert it to (.KST) so give command to convert.
Once it is converted to (.KST) style you can now use it however you want for example renaming it later to .MID (midi file) in order to edit it in a daw (Cubase etc.) and after and after finishing processing exporting it (from your daw) as midi file (0) and finally renaming again as .KST style and import again as style to Event.
Regarding your second question, no, it is not possible. There is of course a new function which is called (Lock Drum) but I still don't understand how it works. Let me research it more and let you know.
Of course, this limitation mainly applies to Real Drum Factory to which we do not have access. If Real Drums (or Live Drums as it used to be called) is a user file, then we can create a new Real Drum file (folder) for example DISCO_130_A & DISCO_130_B where in the second folder we will have renamed the loops differently. For example, we will rename ARRD as ARRA and so on.