The phrase "a difference of a few" is correct and usable in written English.
It can be used when discussing a small or minor variation in quantity, amount, or degree.
Example: "There was a difference of a few dollars between the two prices, making it hard to choose."
Alternatives: "a small difference" or "a slight variation".
While a direct comparison of the absolute and average values revealed a difference of a few millimeters, it is the analysis of different aspect ratios that has clinical relevance with a combined impact on both shape and size.
"Just a difference of a few zeroes," the Arizona Republican Party chairman, Mike Minnaugh, said dryly today.
With the international gas trade worth an estimated $250 billion or more, even a difference of a few cents can make a big difference.
The mechanism by which a difference of a few hours in receiving antibiotics can be deleterious is difficult to understand given the historical data regarding how long it takes for antibiotics to influence outcome.
This might not really affect its mass very much – adding or taking off a couple of metres of thin tail and you'd only really make a difference of a few kilos on an animal that was upwards of 7 or 8 tonnes.
A difference of a few fifths of a second in a breeze time can be worth hundreds of thousands of dollars when the horse enters the auction ring, and the difference between profit or loss for the pinhooker who risked millions buying those yearlings.
A difference of even a few feet will sometimes help get a call through.
In that lower range, a difference of only a few points can mean paying thousands of dollars more in interest.
Often, a difference of only a few degrees in temperature determines whether a bacterial disease will develop.
If they were not married, each one's tax would be $4,866, or a total of $9,732 -- a difference of just a few dollars.
The better vantage point was a difference of only a few feet, but it was the incredible Bonds, so every inch mattered.
