In order to make that when I did my complete score edit for Episode III, I used the instrumental version I made for EPisode I, and layered over the DVD rip from Episode III.
We know from the recording sessions, not to mention the vocals themselves, that the choir was re-recorded for Episode III. Exactly how much or in what sort of edit of DOTF they were recorded, we dont' know... but the vocals were recorded specifically for Episode III, so if you listen carefully, you can hear slightly different pronunciation, annunciations, and lengths and even the mixing of voices. I think a smaller choir was used.
That's what I used.
On another note, I've made a very preliminary attempt at editing Part IV... specifically the conversation between Yoda and Qui-Gon. There are a few errors that I havn't fixed yet, but I wanted to post this to show where I'm going, what I'm using, and to get any ideas or input.
You can download it here:
Part 4 Version 1
Let me know what you all think.