If you're using the same MAF and injectors in the blowthrough setup it should be darn near close, eh?
Maybe I'm misunderstanding your question.
Anyways, just looked in EECAnalyzer and it has this for the ProM 42:
16.00 2160.024
5.00 2160.024
4.80 1935.454
4.60 1727.867
4.40 1536.248
4.20 1360.344
4.10 1277.968
3.90 1123.608
3.70 983.189
3.50 855.443
3.30 740.116
3.20 686.889
3.00 588.291
2.80 500.085
2.60 421.511
2.50 386.026
2.30 321.140
2.10 264.110
1.90 214.938
1.70 172.356
1.60 153.346
1.40 120.142
1.20 92.515
1.00 69.449
0.80 50.946
0.70 43.089
0.50 29.909
0.30 20.024
0.10 12.420
0.00 9.632
EDIT: I see what you're saying - you've got two chips going. What blower are you running?
EDIT 2: Hell, not my day for reading - you're getting a KB.
I'd get the SuperChip read, load it into your twEECer and go from there with the tune. Seems like a turbo and KB would build boost in a similar spot so you shouldn't be too far off.