The phrase "are thought to differ" is correct and usable in written English.
It can be used when discussing perceptions or beliefs about differences between subjects or entities.
Example: "The two species are thought to differ in their mating habits and feeding behaviors."
Alternatives: "are believed to vary" or "are considered to be different."
'Major environmental difference' is not easy to quantify, but Eurasian beaver are thought to differ little in physiology, behaviour or habitat preference and the environments that they inhabit are broadly similar (Heidecke 1986; Rosell et al. 2005).
In both diseases it is believed to result from destruction of cells caused by an autoimmune reaction i.e., the reaction of the immune system against the body's own cells but the particular mechanisms responsible for the tissue injury of dermatomyositis are thought to differ from those that give rise to polymyositis.
All women are thought to differ from all men in this respect (or respects).
are thought to differ in logical form, even though they share a common syntactic and semantic structure, because they differ in the placement of the logical constants "every" and "some".
Prokaryotes are thought to differ from eukaryotes in that they lack membrane-bounded organelles.
Serum 25-hydroxyvitamin D3 levels are thought to differ by country and region.
Late-life depression is thought to differ in clinical presentation from early-life depression.
The other three factors identified by Mak were thought to differ from the two factors found by Cheng et al. Furthermore, there was no similarity between the results of Mak's study and those of Liu and Jackson's (2008) study.
In ancient times, two black minerals from Magnesia in what is now modern Greece, were both called magnes from their place of origin, but were thought to differ in gender.
In an older review of the ichnotaxon [4], Anchisauripus was thought to differ from either Grallator or Eubrontes by possessing a short, caudally-directed hallux impression that was frequently detached from the remainder of the print [43], but this has been interpreted (based on a specimen misidentified as the holotype [38]) as a fragment of a mud crack that intersects the impression [46].
Pathophysiology of these excluded conditions is thought to differ from that in the included anxiety disorders.
