ECM EPROM versions on different models?

I may be looking to buy a used 1.6M ECU. I know the 1.6M ECUs were used on single injector bikes like the ST2, ST4, 749, certain 916's, and maybe some others. I have seen these ECU's advertised as working across all of those bikes, but wouldn't these ECU's have had different programming for different bikes? In other words, if I bought a 1.6M ECU that came from a 916, should I expect the maps to be incorrect for an ST2?

Thanks,
Mike