ST1 Euro spec has cloth Recaro`s and the centre consol is same as the ST3 in USA, except the hand brake in Euro spec ST is leather.
ST1 front interior image below
North American ST1 interior image below
The ST3 Euro spec Recaro front seats have an extender function of the seat cushion, front panel.
Euro ST has LED tail lamps. A few other differences, plus a bunch of tech options.