zzzdreams

HI All, I need to replace 1 of my rear alloys on my standard 05 Z. Stamped on it is "offset 30 18 x 8 JJ REAR" and its the original 18" - ive been offered one with the same markings, except its is stamped "FRONT" does that matter, aslong as the other details are the same, ive got a new 245/45/18 tyre ready for it, but didnt know if the actual wheel specs front and rear are the same? The manual seems to say they are, by the fact they are stamped front and rear makes me a little confused so, wanted to check it out with other if possible - apologies if this seems a stupid question! Hope some one can help!!?