VW brought out the supposedly limited run Mk1 Scirocco before they brought out the Mk1 Golf. I think they share the same floor pan and running gear.
The Mk2 Scirocco inherited the later Mk1 Golf's interior, floor pan and engine options. Although I think that as the Mk2 Golf came out, some of the bits from that made their way into the Mk2 Scirocco.
That's what I presume anyway.
My mate's Mk2 Scirocco Scala (E reg) had the same 1800 carb engine as my Mk2 D reg Golf GL, but had the Mk1 Golf style dash.