OE 18" from the E46 M3 are 18x8 +47 and 18x9 +27.
OE 18" from the E92 M3 are 18x8.5 +29 and 18x9.5 +23.
To even get close to the look of the standard 18s from an E92 M3, you would have to use well over a standard 18mm spacer up front and roughly a 10mm spacer in the rear.
If you can find square OE 18s from an E46 M3, which are rather readily available depending on where you live, I personally think that would be a better route in regards to fitment.
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F80 M3 DCT|Alpine White . Black Leather | My Build Thread
E90 M3 DCT|Melbourne Red . Speed Cloth | My Build Thread
E46 M3 6MT|Jet Black . Black Nappa Leather | My Build Thread
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