Bujold: Paladin of Souls--I want the 1st edition...HELP!

On Amazon, bless their hearts, there are two editions, both of which claim to be “First Edition” dangit. How do I tell which really is?

Paladin of Souls - 006057335X Eos/HarperCollins 2003
Paladin of Souls: A Novel - 0380979020 Harper Voyager September 23, 2003

Can anyone help?

This listing on Abebooks of a limited edition signed copy seems to indicate that it’s the true 1st edition.

http://www.abebooks.com/servlet/BookDetailsPL?bi=5396621532&searchurl=kn%3DPaladin%2Bof%2Bsouls%26sortbox%3D1%26sortby%3D1%26sts%3Dt

This eBay listing also backs up Eos as the true 1st.

http://bit.ly/Xjcoao