The phrase "a different purpose in" is correct and usable in written English.
It can be used when discussing the specific intention or goal associated with something that differs from another context or situation.
Example: "The new policy was implemented with a different purpose in mind, aiming to improve employee satisfaction."
Alternatives: "a distinct aim in" or "an alternative objective in".
In fact he had a different purpose in mind.
But the Masters' Select funds use multiple managers with a different purpose in mind.
Jelly had a different purpose in listening to anything or anyone.
But a group of investment banks and a hedge fund have a different purpose in mind: delivering antibiotics and other medical supplies to refugees in war-ravaged Darfur.
Over at the University of Chicago in Illinois, Xiaoyang Wu is generating genetically modified skin with a different purpose in mind.
Diana Cooper has been an important part of the Godolphin team for many years, representing the team all over the world, but she has been required for a different purpose in recent weeks.
Ronald Shmyr, a U.S.-based banker and a self-professed audiophile, owns several different pairs, each for a different purpose: Sony in-ear buds for music, Shure in-ear buds for athletics, over-ear padded Sennheiser headphones for comfort, and the full-size Bose for noise canceling.
But when he travels westwards, to America's Pacific coast, say, his well-honed talent for public relations is needed for a different purpose, often underestimated in Europe: simply reminding people that NATO exists, and that small conflicts in remote corners of Europe have some claim on their attention.
Camouflaged text is used for a very different purpose in "The Secession Quilt," sewn in 1860 by a South Carolinian, Jemima Ann Cook.
The apocalyptic material there serves a different purpose than it did in Revelation and some other Christian and Jewish text.
But The Bachelorette served a different purpose: like the heroine in a Mills and Boon novel, she is meant to be relatable – and with the snort-laughing, smart and funny Sam Frost, she was.
