Stick the wheel sizes into an online calculator and it will tell you how much more inboard/poke you'll get.
Online Wheel and Tyre Fitment Calculator | Will They Fit - 18x7.5 ET41 vs 18x8 ET51
I'm not 100% sure on the tyre sizes but you'll see the Golf wheel sits 4mm more inboard from the guard than the stock Scirocco wheel and is 16mm closer to your strut. If anything you want it to go the other way.
Something like this is a nice fitment for a Scirocco: Online Wheel and Tyre Fitment Calculator | Will They Fit - 18x7.5 ET41 vs 18x8 ET35
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