ODO doesn't distinguish them, except calculus's definition about which I'm not asking. ''different' is synonymized with 'differential', and vice versa.
Why can't 'different' substitute 'differential' in the red underlines beneath?
Source: Introduction to Politics: First Canadian Edition (2012 1 ed., but ∃ 2016 2 ed.). p. 87 Top
From the right, Rawls's major critic has been the American philosopher Robert Nozick (1938—2002). Nozick was writing from a libertarian perspective, which calls for a state focused on protection of property rights. He put forward a procedural theory of justice in which the main concern is not the outcome (e.g., meeting needs) but the way in which property (in the broad sense, meaning anything possessed by an individual) is acquired. It is therefore a historical theory in which "past circumstances or actions of people can create differential entitlements or differential deserts to things" (Nozick, 1974, [Anarchy, State, and Utopia]: p. 155). Provided that the property was acquired fairly, then the owner has a just entitlement to it. Nozick considered any attempt to redistribute property, even through taxation, to be unjust.