The difference has two main facets, the child's lives and the child support paid.
The impact of the first would be entirely situational although in general the greater the distance between the parents the more likely that the care would be split more in favour of one parent, not that distance is the only factor considered.
The amount of child support is adjusted according to a set of bands that determine the percentage of the cost (aka the Cost Percentage) of the child that is considered as having been met by the parent.
For care from 0 to less than 14% (0-51 nights), termed as below regular care, the Cost Percentage is 0%.
For care from 14% to less than 35% (52-127 nights), termed as regular care, the Cost Percentage is 24%.
For care from 35% to less than 48%, termed as shared care, the Cost Percentage is 25% plus 2% for each percentage point over 35%.
For care from 48% to 52%, also termed as shared care, the Cost Percentage is 50%.
For care from 52% to 65%, also termed as shared care, the Cost Percentage is 51% plus 2% for each percentage point over 53%.
For care from 65% to less than 86% (238-313 night), termed as primary care, the Cost Percentage is 76%.
For care from 86% to 100% (314-365 nights),termed as above primary care, the Cost Percentage is 100%.
Child support is worked out by first ascertaining the Child support income of each parent, adding the two and then determining the cost of the children based upon the number and ages of the children and parent's child support is then on a per child basis the cost of that child less the cost less the Cost Percentage, the amounts of all children are then applied.
It is quite complex to work out. However, you could use the Child Support Calculator . The one on here has unfortunately not been kept up to date (some core values are updated on an annual basis). The linked calculator is the same core code as the calculator available here, just that the file with the annual values has been maintained.