What's the deal with Lalafells and Miqo'te still sharing voices?

Male Miqo'te 1=Male Lalafell 4
Male Miqo'te 4=Male Lalafell 6
Male Miqo'te 7=Male Lalafell 9
Male Miqo'te 10=Male Lalafell 12

Female Miqo'te 3=Female Lalafell 2
Female Miqo'te 6=Female Lalafell 5
Female Miqo'te 9=Female Lalafell 8
Female Miqo'te 12=Female Lalafell 11