I am confused with those 2 pdf downloads:

Birthright
Rulebook
Version 3.0 draft 8
November, 2001

and

Birthright d20
Campaign Setting Rulebook
FIRST RELEASE PLAYTEST RULES
(DRAFT VERSION; UNSANCTIONED)
Version 0.0; Jan 30, 2003

It seems that the first one updates the second (version 3) while it predates it? There are several differences in these two docs regarding the rules. Is there something newer that the community has worked on?

Whatever, looking to convert my newly started 2E BR campaign to 3.5, but don't really know which download to use.

Please someone clarify?