They are not interchangeable with our cars, the Z4M ESS supercharge kits are unique to Z4Ms. The charger itself is the same i guess but the intake plenum and assorted mountings are different i believe, Beedub will know as he's got an ESS charger on his M.
This is a veeerrryyy old setup.... And its not interchangeable with the z4ms, this kit uses the stock intake, ess completly stopped production of this kit as it was blowing apart the stock intake......
The new kits are a world away from this setup and easily fills 2 giant wooden crates such is the never ending parts needed to setup ablower on the z4m. I would wager ess would not support this being fitted to any car now, and would not assist with getting it working......