"relatively small difference" is correct and usable in written English.
You can use it when you are discussing two similar things that have only a slight variation between them. For example, "There was a relatively small difference between the two competing candidates in the election."
dubium, showing a relatively small difference in level of germination among the three different climates (Figs 3 and 4).
It turns out that subsequent analysis of mutations from different α values also leads to a relatively small difference.
Alternatively, the relatively small difference in these two apparent rate constants could be a consequence of using different fluorescent components in the two assays.
The biggest problem with MRAM is a relatively small difference, difficult to detect, between its "on" and "off" states.
The relatively small difference between the genders in both horses and dogs agrees with the lack of evidence of relevant physiological dimorphism in both species.
This method of stimulating the auditory hair cells is inefficient, however, because of the relatively small difference in density between the body tissues and the otoliths.
Fixed-rate mortgages are available now for about 5.25percentt for people with good credit, and adjustables are offered at about 4.75percentt -- a relatively small difference.
But since they found a relatively small difference in risk between bonds and shares, a six-point premium looked ridiculously high.
During the campaign, reporters frequently cited the relatively small difference in proposed Medicare savings between Clinton and the congressional Republicans as evidence that the Democrats were exaggerating the Republican "threat" to Medicare.
This relatively small difference had a profound effect, particularly on black students: 72percentt revised their paper if they were told the teacher had high expectations, while only 17percentt revised it otherwise.
But assuming that they did not, the maximum addition to the pool available to Hall would be 579,000, probably a relatively small difference in terms of the total number of eligible signers.
