The classic Import object has a new option to create a copy of all fields with a suffix. This gives you access to all the data prior to any mapping or calculations being executed. New option is on the Options tab and the user can change the default "_ORIG" suffix to their own.
Any field with the same name in the Layout will be overwritten by the second field.
I.e. Source Field is CURBAL_ORIG, only the one field will exist. Please change the suffix to ensure a copy is made