No easy way as far as I know, if you download the pa3x manual and the Pa600 manual it's qite easy to compare the factory data list.
By the same token you could load the Pa3x sets onto a memory stick and load the style's your interested in as you need them I find it very easy to load new styles in, couple of minutes.
I'll get my skype up and running again I've had a prob with my computer and had to reformat the hard drive, no back up's of course, fresh start. Speak to you soon.
BTY i've just tried the lyric's on the songbook assigned the two button (Lefthand) to text up and down, I can read the lyric's without my specs, even when the small text is selected, it displays about a verse on a page, away goes my music stand.