Back in the day for about six months the only PC set up in one of the major department stores was an Amstrad.
Sometimes I would get a feel for a game on it and buy the C64 version.
Most of the time I didn't get stung too badly. (I bought Jet Set Willy 2 on the C64 on the basis of the Amstrad one and although it looked and sounded roughly the same it just never felt as 'right' as it did on the Amstrad.)
The one sting was The Rocky Horror Picture show.
OK, the game was no great shakes in the first place. It was a fairly drab collect 'em up.
I was probably taken with the surreal 'drug' room with the menacing syringes.
But what was an average looking game on the Amstrad was turned into a woeful looking one on the C64.
Behold

Amstrad Rocky Horror Show.

C64 Lego Horror Show