just doing some preliminary googling (ahem /ubbthreads/images/graemlins/wink.gif) I found this from a wrx, but it at least paints part of the picture.
they go into some details here:
click but it looks like they only ran that baseline between the two, and only did tuning & tweaking with the 3076r.
I'm not sure that the 3071R is going to be any better than an HTA68 in terms of performance or responsiveness, but someone else may be able to comment more on that.
At that small size & power level I would definitely not want a dumped wastegate (run recirculated IMO).