The phrase "a small difference between" is correct and usable in written English.
It can be used when discussing minor distinctions or variations between two or more items, concepts, or situations.
Example: "There is a small difference between the two models, but both serve the same purpose."
Alternatives: "a slight variation between" or "a minor distinction between".
Now, the different CCD_IDs are not read out simultaneously; there is a small difference between each CCD, so the same frame number from different CCDs covers a slightly different time range.
Quadriceps muscle strength (measured using a strain gauge) was significantly different for men and women, but showed only a small difference between residential settings.
But there is a small difference between Harries and the government, he says.
To detect a small difference between two treatment groups in a clinical trial, a much larger sample size is needed.
In fact, such are the levels of all-round student contentment that there is now only a small difference between the highest and lowest ranked universities.
There was, she concluded, not even a small difference between one house and the next; the only thing she could compare it to was a poultry incubator.
These data attest to a high degree of overlap between δ18OPDseawater and δ18OBSfluid with a small difference between their mean values (Fig. 6).
This lead to only a small difference between the two best solutions, regarding the diurnal patterns of the WW flows at the outlet of the neighborhood sewer system.
The low temperature lift heat pump (LTLHP) utilizes a small difference between the condensing and evaporating temperatures of a working fluid.
I've not experienced it before, but there is such a small difference between what you earn for first and second place, just two points.
Numerical results are presented to show that there is only a small difference between the on-axis pressures radiated by phased cylindrical arrays and planar arrays.
