Yes. They should fit.

Offset is the distance from the centre line of the wheel, to the mounting face.

http://www.driverstechnology.co.uk/wheel-offset.htm

Although your wheels will sit 15mm further out, they are 1 inch smaller so will be 12mm narrower on each side of the CL. So only going to sit 3mm further out. Tyres will have less of a stretch on them due to the wheels being narrower.