The difference between those binary powers and base 10 also gets worse with bigger numbers.
With kilo / KiBi it's just 2.4%, but with teraBytes it's already increased to 10%
>>> pow(2,10)/pow(10,3)
1.024
>>> pow(2,20)/pow(10,6)
1.048576
>>> pow(2,30)/pow(10,9)
1.073741824
>>> pow(2,40)/pow(10,12)
1.099511627776