its possible only the mk3 uses it, but it can be used for lots of other aplications,
the connector consists of 4 plugs, a 12 pin, a 16 pin, a 22 pin and a 26 pin plug
a lot of japanese cars use a combination of these plugs, for instance: some miata's just use the 26 and 22 pin plug making it a 48 pin
this is beter explained in this image:(sourced from diyautotune)
there may not be a direct advantage of using the 76pin, but they seem to be easier to find in stock.
Here is a directly copied list of known engines that will work:
Make Model Engines From To Notes
Acura Integra All 1992 1995
Acura Legend C32A 1991 1995
Dodge Stealth All except SOHC 91-92 1991 1996
Ford Aspire All 1994 1997
Ford Escort 1.8 DOHC 1991 1995
Ford Festiva All 1990 1993
Ford Probe F2, F2T 1990 1992
Ford Probe KLDE 1993 1995
Eagle Talon 4G63 1995 1998
Honda All All 4 cylinder 1992 1995
Lexus LX450 1FZ-FE 1996 1997
Mazda 626 All 1990 1995
Mazda B series pickup 2.2 and 2.6 with EFI 1990 1993
Mazda Miata 1.6L BP 1990 1993
Mazda Miata 1.8L BP 1994 1995
Mazda Miata 1.8L BP 1996 1997
Mazda Miata 1.8L BP 1999 2000
Mazda MX-3 All 1992 1995
Mazda MX-6 F2 1990 1992
Mazda MX-6 F2T 1990 1992
Mazda MX-6 FS (2.0 4 cylinder) w/ manual transmission 1993 1997
Mazda MX-6 KLDE, KLZE (V6) 1993 1995
Mazda Protégé All 1990 1998
Mazda RX-7 All 1989 1995 Boost control output is intended for single turbos.
Mitsubishi 3000GT All 1991 1998
Mitsubishi Diamante 6G72 1992 1996
Mitsubishi Eclipse 4G63 1995 1999
Mitsubishi Eclipse 2.4 w/ manual transmission 2000 2004
Mitsubishi Lancer EVO 4G63 2003 2005
Mitsubishi Lancer 2.0 NA w/ manual transmission 2002 2005 Includes O-Z Rally Edition
Mitsubishi Galant 2.4 (4G64) 1994 2000
Mitsubishi Mirage 1.8 SOHC 4G93 1993 2000
Mitsubishi Montero 3.5 V6 1994 1997
Subaru Impreza All 1993 1995
Subaru Legacy All 1991 1994
Subaru SVX All 1992 1995
Suzuki Sidekick 1.6 MFI 1992 1995
Suzuki Sidekick All w/ manual transmission 1996 1998
Toyota Celica 3SGTE 1990 1991
Toyota Corolla AE101 4AGE 20V Silvertop automatic trans 1992 1995 JDM model
Toyota Corolla AE111 4AGE 20V Blacktop 1996 2000 JDM model
Toyota Corolla 1ZZ-FE 1998 2002 Current firmware does not control VVTi on 2001-2002
Toyota Echo 1NZ-FE 2000 2002
Toyota MR2 3SGTE 1991 1995
Toyota MR2 5SFE manual transmission 1993 1995
Toyota Paseo 5E-FE 1992 1995
Toyota Pickup, 4Runner All 1992 1994
Toyota Supra All 1991 1992
Toyota Tacoma, 4Runner 2RZ-FE, 3RZ-FE 1995 2000 Does not fit 2000 California model Tacoma
Toyota Tacoma 5VZ-FE manual transmission 1995 1997
Toyota Tercel All 1991 1995
looks a lil messy, not realy a forum expert
so the cars/engines listed here will work, most of them wont populate all plugs though
this also isn't a complete list, my engine (the toyota 2E-E) is not listed and will work, it would use the 16 pin and the 26 pin
Hope this makes a little sense