If you try to upload the same conversion with the same combination of GCLID, conversionName, date and time, AdWords will ignore it. If you want to upload multiple conversions of the same type for the same click, AdWords will record them as long as they have different times, even if the GCLID and conversionName are the same. Please see this
article for more information on importing conversions.
Shwetha, AdWords API Team.