User stories related
I wish seek a clarification on user stories. In one of the solution which is given below, (please consider the numbers are examples)
"While estimating user stories care should be taken to have right scale. stories with 89 and 90 story points are not allowed as % difference between them is too small. Keep in mind that % difference should be respectable to be able to discern the difference of estimates between user stories"
Is it that user stories (value) need to be close to each other per theme or is there a scale concept ?