Take equality of opportunity, assume people with different preferences and abilities. Then different results for these people will arise, a different distribution of goods. That’s mediated through preference orders and trade-offs, as well as through allocation based on ability.
It’s remarkable that such an outcome is still commonly called”inequality”; note usage of the phrase “equality of opportunity” as the opposite of “equality of outcome/result”. In truth, any different outcome under the rule of equality of opportunity is not an “unequal” outcome. As far as justice is concerned, and that’s what this is about, it’s a different yet equal outcome.