[s-cars] Dumb question--identifying original ECU chips

[Tony Guttmann]

Deaer Listers,

When my original ECU chips were removed, they weren't labelled
Boost or Fuel. I want to put themaback into the ECU as an experiment, 
but don't know which is which.

One has p/n 1 267 357 483 on a stick-on label, and LDP 9349 /B 58 235
on the chip, the other is 1 267 357 391 BLUP9401401/B 58 157

Can someone out there please tell me which is which?

Thanks,
Tony Guttmann '94 S4