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The phrase "are much harder" is correct and usable in written English.
It can be used when comparing the difficulty of two or more things, indicating that one is significantly more difficult than the other.
Example: "These math problems are much harder than the ones we solved last week."
Alternatives: "are significantly more difficult" or "are considerably tougher."
Dictionary
are much harder
adverb
To a great extent.
Exact(58)
Sodium levels are much harder to trace.
Mismatches are much harder on the players.
I know, there are much harder jobs.
Reputations are much harder to hedge, however.
The floors are much harder.
Some moments are much harder.
But spiritual lapses are much harder to measure.
Pollution regulations are much harder to enforce there.
Memory problems, therefore, are much harder to diagnose.
Books are much harder to overwrite with a different message.
But physical memories are much harder to ignore.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com