Which Golub breeds come in Svračja?

Club breed standards describe Svračja for the Modena.

Golub pattern

Svračja

Dark and white in a set arrangement: the Magpie duck's colored cap and back, magpie rabbits and cavies.

2 Golub breeds list Svračja. It is in a club standard for 2 breeds.

Breed	NPA	BDRG
Modena	Prema standardu (“The color descriptions apply to both Schietti and Gazzi, with the exception of the white on the Gazzi body.”)	Prema standardu (“Gazzi Blau mit bronze Binden; Gazzi Blau-bronzegehämmert; Gazzi Dunkel-bronzeschildig-gehämmert”)
ModenaGazzi	Prema standardu (“The color descriptions apply to both Schietti and Gazzi, with the exception of the white on the Gazzi body.”)	No ruling