Nope, VA was coded from scratch
And yes, Rusnak's script is most likely overused - there was a time, when adoptable sites hosted at myadopts were appearing one after another. It still is probably is the most advanced free one. And the blandness doesn't come from the script itself, but from the generic sites being released almost without any changes to code/layout.
AFAIR ZarnIsland is being created by ex-admin of MagiStream, hence probably the similiarity.