According to the docs below is the fieldnames you get with an export so importing will use the same:
FIRST NAME, MIDDLE NAME, LAST NAME, JOB TITLE, COMPANY NAME, WORK PHONE, HOME PHONE, ADDRESS LINE 1, ADDRESS LINE 2, ADDRESS LINE 3, CITY, STATE, STATE/PROVINCE (US/CANADA), COUNTRY, POSTAL CODE, SUB POSTAL CODE, CUSTOM FIELD 1, CUSTOM FIELD 2, CUSTOM FIELD 3, CUSTOM FIELD 4, CUSTOM FIELD 5, CUSTOM FIELD 6, CUSTOM FIELD 7, CUSTOM FIELD 8, CUSTOM FIELD 9, CUSTOM FIELD 10, CUSTOM FIELD 11, CUSTOM FIELD 12, CUSTOM FIELD 13, CUSTOM FIELD 14, CUSTOM FIELD 15
I think you may have copied the fieldname from the constantocntact.com website rather than the developer docs?
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