A publishing mix-up has been blamed after Sydney's Daily Telegraph accidentally published two pages of the Sydney Morning Herald.

A number of readers noticed the error when flicking through the Thursday edition of the Telegraph, and stumbling upon the Herald's misplaced editorial pages.

The Telegraph released a statement on Twitter later in the morning to clarify the mistake.

"Good morning readers, today @DailyTelegraph printed 2 pages from The Sydney Morning Herald in some editions," the tweet read.

"Both papers share the same printing facility in Sydney's west and the error happened during the production process.

"We apologise for any confusion this has caused."

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In 2018, Fairfax and News Corp agreed to share a printing facility in an attempt to offset newspaper decline.

"The printing arrangements make the production of newspapers more efficient for both publishers. These are landmark initiatives," Greg Hywood, former Fairfax chief, said at the time.

"They demonstrate a rational approach to the complex issues facing the industry."