Similar music albums with different GTIN

There have been observed instances of an album apparently released under multiple GTINs i.e. multiple albums with same content but different GTINs.

Instances include:

• Otros Aires - Otros Aires
  • http://www.tango.info/07796095003394
  • http://www.tango.info/07798135080013
• Gotan project - La revancha del tango
  • http://www.tango.info/07798014098054 label: Random
  • http://www.tango.info/03760038140112 see 03760038140112 label: Ya Basta
• Biagi Ortiz
  • http://www.tango.info/00724349536524 - believed released 1998-2002? - cover with face of Biagi
  • http://www.tango.info/00094637915820 - believed released 2006/2007