The phrase "are limited when compared" is correct and usable in written English.
It can be used when discussing the constraints or restrictions of one thing in relation to another.
Example: "The resources available for this project are limited when compared to those of larger organizations."
Alternatives: "are restricted in comparison" or "are constrained relative to".
Their information was limited when compared with the internet's infinite channels of wisdom.
Despite the well-rated new design and the prestigious manufacturer, the BMW i3 still faces the same issues as other electric cars, chiefly that its range is limited when compared with gasoline-powered vehicles.
The variety of the marine flora and fauna of the Gulf of Guinea is limited when compared with that of the western tropical Atlantic and, especially, with the Indo-Pacific biogeographic realm.
It is still clearly in its early stages – the library is limited when compared with, say, Netflix – but there are a few interesting titbits already available, including Adult Swim series The Venture Bros and Tim And Eric Awesomee Show, Great Job, and clips from Comedy Central's stand-up archive.
However, the changes in the "LD" exclosure were limited when compared with those observed within and outside the "US" and "MM" exclosures.
Therefore, it can be concluded that the influence of the CNTs' piezoresistivity on the total piezoresistivity of the nanocomposite sensors is limited when compared with the two other working mechanisms.
Parametric study conducted on the Smart Probe shows that the effect of the Poisson's ratio of the cementitious material on the resonance frequency is limited when compared with that of the dynamic modulus.
Plug-in hybrids offer some potential, but the assumption that we will have a clean electric grid in the next decade or two is optimistic; in that time frame, the percentage of coal on our grid is likely to stabilize at best (if not grow), meaning that the actual reduction in carbon emissions will be limited when compared with gasoline.
Although some individual-level interventions are effective, their reach is limited when compared with community-level interventions.
