Hello everyone! I have a question. Are these songs mixed in a different way or they are the same versions from the original albums? Thanks in advance. link
As far as I know, that cd single box was released around 1990 and it's out of stock now. It is referred to in the Japanese Record Collector magazine and other one featuring Queen and according to them, those numbers are the same ones as the original singles, not mixed in a different way.
Ron's site has info about this: link
And based on his info plus having heard the unique versions that it does contain, the only different versions are:
See What A Fool I've Been (not a different version, but one of only a handful of CD releases of this b-side)
Funny How Love Is (proper intro without anything from 'March of the Black Queen')
Flick Of The Wrist (proper ending with 'baby you've been had' and ending on the isolated guitar)
I'm In Love With My Car (single version has car sounds and stuff at the beginning rather than the end)
Tenement Funster (has a proper ending without Flick Of The Wrist crossfading on top)
Soul Brother (b-side)
I Go Crazy (b-side)
A Dozen Red Roses For My Darling (b-side instrumental)
I think that's it. The rest are common versions. A couple others are single mixes (Fat Bottomed Girls, Break Free, One Vision) but those are easily available elsewhere.