US style has tufts and rumpless (though birds can be born without either or both traits). Tufted to tufted does indeed kill off the homozygous tufted chicksThe color looks like Isabel (Lavender Wheaton) to me. Not all Araucana are rumpless some do have tails. They also can have ear tuffs and can have small crests. However, if you breed ear tuff to ear tuff I believe it causes a lethal gene.
British style has muffs, crest and tail.