also nayrt, just for reference, skins/accents CAN have the same names, even festival skins, so they most likely wouldn't have changed it if 'Firebird Feathers' had been it's name to begin with. The most obvious example of this would be the Wildfire skins, which came from the 2013 Thundercrack and 2015 Flameforger festivals.
Re: sadkfjsdf
http://items.kanojo.de/?item=1451
http://items.kanojo.de/?item=12548