Phantasy Star Generation I Versions

[Ikusagami]

Sorry if this has been addressed somewhere already; I wasn't able to find it in a search.

The readme accompanying the ISO download and the regular patches read version 1.0
The readme accompanying the XDelta patch says 1.3
Can anybody tell me what changes, or simply if the changes are important, have been made to the XDelta release? I've already got the iso burnt and working, and I'd rather not fiddle with the XDelta, but I also know how many bugfixes and changes can go into two new versions. Any help would be greatly appreciated.

Also, since the main page says it hasn't been verified on hardware, I'd like to confirm that the ISO, when burnt to CD (not DVD) works perfectly on a PS2 Fat with the CD version of Swap Magic.