...The new M3 (with the manual box and rear wheel drive) tips in at 1705 / 1780 kg (DIN/EU) unladen weight. The M4 is 5 kgs lighter. This means that both are roughly 200 kgs heavier than its predecessors. (M3 185 kgs / M4 + 203 kgs)...
https://www.bmwblog.com/2020/09/23/b...top-20-things/
ie 407 and 447 pounds heavier respectively but M Race track package reduces 55 pounds only
edit from link above,
12. M Race Track package is new
M Race Track Package offers a reduction in weight of about 25 kgs. This package includes M Carbon ceramic brakes, weight-minimized M light-alloy wheels (available as an option with semi-slick tires) and the M Carbon bucket seats. Other options in the package which are market depended are the M Driver’s package and the carbon high gloss interior package.