i don't hear the two pedals the same. my Fulltdrive is much more transparent than my Tubescreamers. im not too versed on circuits and all that but in my rig they sound quite different

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CURRENT RIG:
Telecasters->Fullton Clyde Wah->MXR Phase 90 (r28 mod)->Fulltone Fulldrive2->Ibanez Tube Screamer TS-808->->Boss GE7 EQ->MXR Stereo Tremolo->Boss TU-2 Tuner->Boss Giga Delay->Crate V3112

AMPS
1959(?) Airline-Montgomery Ward
1967 Univox-Lafayette
1972 Fender Twin Reverb
1984 Marshall JCM 800 (2204)
1998 Fender Ultimate Chorus
2003 Crate V3112