Paul Lamey over at Expository Thoughts has a clever post on N. T. Wright's changed position on justification through the imputation of the righteousness of Christ. His post title is "They can't both be 'Wright'"!
Here are the two quotes which were written 25 years apart.
“Justification by faith is the heart of the Gospel. This is what is contained in the promise, ‘Whosoever believeth in him shall not perish, but have everlasting life.’ If we fail to grasp the fact that the righteousness which justifies us is imputed and not infused or inherent, we shall find that, in substance, what we preach is a gospel of works, not a Gospel of grace” [from N. T. Wright (along with John Cheeseman, Philip Gardner, and Michael Sadgrove) in the 1972 edition of The Grace of God in the Gospel (Banner of Truth)].
“If we use the language of the law court, it makes no sense whatever to say that the judge imputes, imparts, bequeaths, conveys or otherwise transfers his righteousness to either the plaintiff or the defendant. Righteousness is not an object, a substance or a gas which can be passed across the courtroom . . . . To imagine the defendant somehow receiving the judge’s righteousness is simply a category mistake. That is not how language works” [from N. T. Wright in the 1997 edition of What Saint Paul Really Said (Eerdmans)].