Last time i spoke CRT they said they use the RS6's KO4 components.
Is it possible they meant to say they were using components from the RS4, rather than the RS6? Getting a 42/56 compressor wheel inside a K03 housing is next to impossible. If they are recycling OEM housings the chances for a 2275-series wheel diminish considerably.
Not that it's such a great compromise to use a 2078 from an RS4. The MAPs are virtually the same.