The phrase "are difficult to equate" is correct and usable in written English.
It can be used when discussing concepts, values, or items that are challenging to compare or relate to one another.
Example: "The two theories are difficult to equate due to their differing foundational principles."
Alternatives: "are hard to compare" or "are challenging to relate".
By the same token, Mr. Robinson said, it was difficult to equate regents with judges, as Judge Naves had, particularly when in this case the regents publicly denounced Mr. Churchill at the outset of the controversy.
It's difficult to equate the image of a group like ISIS, which on the one hand wishes to restore a medieval-style extremist Islam upon the 21st century, while on the other is a tech-savvy movement capable of doing a significant proportion of its recruitment online.
This found film approach is valuable in situations where it is difficult to equate stimuli on the features of interest, which is the case when using naturalistic films that vary dramatically in visual cinematic features that can affect attention and eye movements.
Although it is difficult to equate Carnap's fruitfulness decisions with Kuhn's revolutionary breaks (Kuhn 1993, 313f), Carnap regarded his vision of science as similar to Kuhn's, and he liked the manuscript of Structure that Kuhn submitted to the International Encyclopedia of Unified Science, as George Reisch (1991) has shown.
It is difficult to equate the emotional costs of regretted TOs with the emotional costs of (the fear of) unintended pregnancies.
But, he said, "to try to equate it to a terror attack — it's difficult to compare the two".
Countermeasures are difficult to conceive.
Although it is difficult to outright equate identification with prestige, a comparison with the actual production results from Ang 洪惟仁 (2003) showed that some kind of value judgment has indeed intervened, as there was a large discrepancy between the identification rates and the actual realization rates.
After all, it is difficult to manipulate Americans into equating the current Russian leader with Hitler (as Hillary Clinton has attempted to do) if we are reminded that Russia did more than any other country to eliminate Hitler and that Russia celebrates this triumph as its most important secular holiday.
Before the development of the Teacher Stress Inventory (TSI), the phenomenon of teachers' stress was difficult to access as it was equated with burnout.
