As I previously said, mine is off Celsior UCF2x . Has 5 connectors (same pin configuration is found on ECU's for post 98 Hiace (5VZ-FE), post 98-00 Chaser Tourer S (1JZ-GE), 2000 up JZX110 IR-V (1JZ-GTE), JZS161 Aristo (2JZ-GTE) and others)
Plus my ECU has 1 additional connector for security system (same as with late JSZ161 Aristo).
What I'm really afraid of is that sometimes USDM ECU's have totally different pin configuration (for example, this is true when comparing VVTI 2JZ-GTE ECU's off 1997 USDM Supra and 1997 Aristo).
I would agree that ECU's with same pin configuration would have common wiring parts.