The difference is that the Videokarma URL is
http://www.audiokarma.org/donation.html
While the Audiokarma URL is
http://www.audiokarma.org/support.html
This might have something to do with Paypal changing the rules on what a Donation (aka Charity cause) is vs Contributing to a Site such as this.
I'm guessing that's why is say "PAY" instead of "Donate now also.