'Two cooks spoil the broth'.
You have hit upon a classic computing dilema that is connected with updating, additions, and ammendments of records in a file (or database).
This is one very good reason why Christain - software developer of ZionWorx - made the songs database accessible via a password.
Generating your own database would mean having your own database software and also being competent in setting up (writing) the files; this is no easy task.
My best advice is that you should stick to one person being in charge of the database i.e. having a password that only one person knows. Just imagine if you or the other guy makes exstensive changes to the songs database, then you will be eternally, either having to tell each other exactly what you have done, or be faced with incredible frustration each time you come to use ZionWorx. Having said that, we use a laptop and someone else, other than myself, in our church does add songs or edits the database. He takes the laptop home with him sometimes to do this sort of work. Needless to say, I have discussed this at length and so far we have not had a problem.
The only suggestion that I can make, and Christian might need to ratify this, is to temporarily rename the two database files on your church computer and then load your files that you bring from home. This means they can be named with the name that ZionWorx expects, otherwise it will not be able to locate them.
After you have finished you would then remove your 'files from home' and rename the 'original' database files. The bottom line is which set of files do you really want to use 'yours or the other guys'. It would also be vital that you rename the 'original' files to exactly what ZionWorx expects them to be called.
As you can appreciate, whatever you do; it could be a recipe for disaster.
If all you want to do is add songs to the ZionWorx database or to edit them (if the latter is OK with everyone else), then I would suggest adopting the following practice.
Type any new songs into your word processor and make sure that you save the file as plain text. (You could use Notepad to do this - a plain text editor.) Save the file onto a floppy disc or CD ROM disk. A 3.5 floppy should be adequate size-wise.
Likewise, copy any songs from the ZionWorx database and edit them to how you want them and then save them to your floppy or whatever.
At your church you can open up your file on your floppy disk and then copy and paste the data into the ZionWorx database. I realise this takes time and that time is not always available before a Service; however, it is the trade-off in being able to use a brilliant presentation package such as ZionWorx. The alternative is to maintain songs as PowerPoint files, and who wants to do that when there is ZionWorx