You need to match up the last five digits, 33920 is just the Suzuki code for an ECU. You may be able to interchange with an ECU that has a different last digit, some of those ECUs were also superceded with newer numbers, you would have to check with your main dealer.
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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine 2000 Suzuki Vitara 1.6 8V, many mods 2004 Suzuki Ignis 1.5VVT 4Grip 2006 Suzuki Jimny 1.3VVT JLX+ and many more.
I have a 2004 Grand Vitara 2.5L A/T 4x4. The ECU suffered catastrophic water damage and I'm in the process of trying to find a replacement. This vehicle's ECU has serial # of 33920-52JJ-0. Can I use an ECU with the 33920 but not the same as the last 5 in the serial #? Will an ECU without the same exact serial # have to be reprogramed for my 2004 GV?