If we are trying to tell the difference between two things, we would say:
‘This approach will allow us to distinguish between new and returning customers.’
If we ‘discriminate against’ someone, we treat them badly because of their sex, ethnicity, etc. (something we really don’t want to do with customers). ‘Develop against’ makes no sense at all, and ‘make a difference’ means that you achieve an important change. If we are merely trying to tell one thing from another, we need to ‘distinguish between’ them.
Even after five years, I can’t always distinguish between the twins.
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