one of theory

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But the key part of this right answer is that the change was essentially one of theory, involving a ninety-degree shift in perspective that brought an entirely new picture of the world – our picture, today’s picture – into view; and it was a change that happened with remarkable swiftness.

the book The Age of Genius
author A. C. Grayling

Hi,dear friends. Does "one of theory" mean "the change was a change of theory"?
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