Re: How to move Wiki pages from v1.9 rc3 to v1.9 release ?
Have you tried just upgrading your instalation to 1.9.0, as if it was a 1.8.x version?
http://tikiwiki.org/tiki-index.php?page=UpgradeTo19
I guess it will do fine for your purposes...
Cheers,
Xavi
P.S. Note that PHPWiki is another wiki engine, different from TikiWiki