M Class (W164) wheels

[Redmax]

Almost certainly the silliest question I've ever asked on here, but are M-class wheels more heavy duty than other Mercedes wheels because the vehicle's heavier?

The reason I ask - I'm looking at sorting some winter wheels and tyres, there are some wheels on eBay that are listed as being suitable for the M class, but they're also noted as being for the C, SLK, S, SL, CLK, etc.

Are they likely to be OK?

What offset should I be looking for for a 2011 ML350?

Thanks

[Mars]

I think the ML only shares the same offset with the R-class.

I just sold some ML W164 19" wheels on Ebay for £400 - what I paid for them a year ago.