Not quite. The R3 wheels are 19x8 forged magnesium(?), and are extremely light, but cost about $2000 a set. The second gen wheels are standard cast, 18x7.5 and weigh about 26-28lbs per. The R3 wheels look stunning on any of the newer model Mazdas.
Tim, if it's an option, I agree with Aaron, the second gen Speed3 wheels on the first gen are win.