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The phrase "a couple of key differences" is correct and usable in written English.
You can use it when discussing or comparing two or more items, highlighting important distinctions between them.
Example: "When comparing the two products, there are a couple of key differences that consumers should consider before making a purchase."
Alternatives: "a few significant differences" or "two main distinctions".
Exact(4)
Three groups of employees were given the same technical training with a couple of key differences.
This year, early signs of a strong recovery seem to be fizzling amid external shocks, and writers are beginning to wonder whether the Fed will respond again.There are a couple of key differences, however.
But Meyer says Taulia has a couple of key differences, which include free service for suppliers, a focus on dynamic discounting and the ability to access all invoice expenditures and accelerate payments to receive the supplier discount.
A new study in the journal Psychological Science shows that the brains of procrastinators have a couple of key differences from the brains of "doers"—and interestingly, the results implicate anxiety-about-outcome as a main force in procrastination.
Similar(56)
That said, there are always a couple of key factors that you could tweak to make a big difference to the projected results (good and bad).
We differ, however, on a couple of key points.
A couple of key faults in the logic stand out.
More strategically, a couple of key questions come to mind.
Every poll has a couple of key points.
"There's a couple of key wickets," he replied.
Our job is to do a couple of key things.
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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