Yes, Minty and Mainsail were both originally produced with incorrectly coloured tails. The error was only corrected when the second wave was released three or four months later. So both versions were probably produced in equal numbers and I doubt it affects her value really.
Sorry, I can't help on value, I struggled to sell some on eBay recently but I think there's still a market for them outside the UK. (International shipping probably put people off of buying mine!)