Hi Ulrich,
The difference is very important precisely in your case...
That film is 640-800 ASA, so it's designed to be used with low light and to be pushed always to 1600, being a bit contrasty usually. But 3200 is beyond its limits for getting nice tonality in wet printing...
If you are going to scan, the situation is totally different, because on your negatives you'll have enough information anyway: your original scan will be dark, but digitally you'll make it near perfect, with rich tones and having its nice sharp grain too.
Were they shot in autoexposure or incident? If in autoexposure, did you care about metering an appropriate zone of the image, or shots will vary on exposition?
Cheers,
Juan