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You can buy USB to serial TTL cables that already have the lines broken out to individual female headers.
I like these USB to serial TTL modules for breadboarding. They have more serial signal lines and a 3.3V supply.
Of course, if you can't buy from eBay you might have to find a Nokia cable...
First you should make sure you can't differentiate the two devices by serial number.
Udev Rules To Differentiate Between Multiple Identical Devices - Page 2
If not then you should figure out which chip you have. If it is PL-2303HX rev. D, the EEPROM writer program (1.0.0.3) you have won't work...
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