Yeh RPi and powerchip reflash are the same.
Here is the PDF that shows the same dyno graph ect. All over the site it says 22kw gain, but u look at the graph and their datalog and its only 9kw gain max.
http://www.fueltronics.com.au/datasheets/1/Bmw0231.pdf
Ow yeah and the powerchip reflash costs $1999! WTF!