Wheel offset help

[SDM2812]

Hi there

Looking for some advice.

I have a 2012 seat exeo

Current wheels
7.5jx17 ET42 57.1 centre bore

Looking to put on Seat Leon Mk3 alloys which are
7.5jx17 ET 51 57.1 centre bore

Would these fit or am i right in thinking i will require a 10mm spacer?

Thanks
Steve