"insignificant differences" is correct and usable in written English.
You can use it to describe small or minor distinctions between two or more things. For example, "While there were many similarities between the two candidates, there were a few insignificant differences in their policy positions."
Moreover, despite increasing sodicity over time mainly insignificant differences within the different irrigated treatments were found in December 2005 and September 2006.
Another TEG parameter, K time, showed insignificant differences between the normal controls and different CAPE concentrations.
For different soil series, both significant and insignificant differences in the means of the modeled and the measured SOC were observed.
A small-scale experiment performed independently showed insignificant differences in nutrient contents of samples from different locations.
Both are statistically insignificant differences.
These are not insignificant differences, but they're not major ones either.
I've always been baffled by how much we over-rate the statistically insignificant differences that separate competitors at the top end of the distribution.
Sixty-four percent of the public, with insignificant differences between Republicans and Democrats, said they thought the large, unregulated gifts to political parties from companies, unions and rich people, known as soft money, should be banned.
She likes to say that there are only insignificant differences between Sarkozy and the Socialists, because both are estranged from the French people by their devotion to a Europe that works only for international élites.
There are small, but statistically insignificant differences between the models.
However, the length of mandibular body showed insignificant differences.
