Doubts in report field

Nandhini
Expensify Customer Posts: 4
In Report Exporter API call, we can export report fields but all non-alphanumerical characters in the custom field must be replaced with underscore(_).
Consider there are 2 fields
Field 1] and Field 1[
While replacing with underscore both becomes Field_1_
How to differentiate between both the fields?
Please help me understand this