Hi Linzi,

I would guess that the pickled chillies would contain vinegar (sometimes salt and citric acid too) so all it might do is add a bit more vinegar or acid to the final chutney. You could always give them a good rinse to remove any excess vinegar first. I regularly use pickled chillies for cooking and haven't noticed any change in flavour but that's usually one chilli in a pan of something or other.

Good luck with your chutney.