No they are not the same, surely the discs and pads would be the last things you would want to order (no offence intended).
Off side one here: http://cgi.ebay.co.uk/FORD-FIESTA-st-drivers-side-brake-caliper-mk6-7_W0QQitemZ250585562098QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item3a58103bf2" onclick="window.open(this.href);return false;
There's not loads of STs being broken yet and hence this setup os still quite hard to come by.
I imagine Ford will sell brand new ones, have you tried there?