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The phrase "are known to differ" is correct and usable in written English.
It can be used when discussing variations or differences that are recognized or acknowledged in a particular context or subject matter.
Example: "The two species of birds are known to differ in their migratory patterns."
Alternatives: "are recognized to vary" or "are acknowledged to differ".
Exact(60)
However, they did not have direct measures of body composition or abdominal adiposity, which are known to differ among different ethnicities (18).
The chemical composition and biological activity profile in the same plant grown in different regions are known to differ [ 32, 33].
Rhizosphere properties are known to differ from those of bulk soil, but differences are not always predictable and may be influenced by the kinds of plant roots and by soil mineral composition.
In addition, the information that is specifically found for smooth muscle cells, relates to vascular smooth muscle cells, which are known to differ from bladder smooth muscle cells in different aspects.
Evidence of known groups validity is obtained if groups who are known to differ on the construct of interest score differently on the test.
Construct validity also may be established by comparing groups that are known to differ on the concept of interest (known-groups validity) or comparing groups that are expected to differ after experimental manipulation.
3D7 and W2mef are known to differ in allelic variants of several important antigens, such as AMA1, and use different ligands for erythrocyte invasion [12], [46].
However, respiratory controls and ventilations are known to differ with sleep states.
Spectral and directional reflectance properties of coniferous forests are known to differ from those of broadleaf forests.
Language skills, strongly linked to academic success, are known to differ by socioeconomic status (SES), with lower SES individuals performing less well than higher SES.
The two experimental lines (63 and 72) of chickens carry a uniform MHC B*2 haplotype and are known to differ in resistance to MD.
More suggestions(15)
are known to disagree
are known to vary
are known to differentiate
are known to fluctuate
are known to contradict
are known to range
are well known to differ
are known to make
are observed to differ
are known to create
are known to react
are known to boost
are expected to differ
are known to favor
are known to swim
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com