Is the assimilation of these two formulations of the moral principle by Kant and some of his expositors justified?

In the Analytic of Pure Practical Reason Kant claims that his view of morality agrees with the ancient command that man should love his neighbour as himself. Also in the Fundamental Principles of the Metaphysic of Morals he regards the Golden Rule as a deduction, though with several limitations, from the second version of the Categorical Imperative.