USB pinout

Hello All! I decided to connect the front-USB cord... Well, there is a manual for the case - where 4 wires are labeled Vcc, GND, D-, D+. There is also a manual for the motherboard, which shows the pinout of its connector for additional USB. And now the most important thing: There are 2 motherboards - Chaintech 5ATA and 7AJA2-100. And the description of the connector is different - D+ and D- are swapped (and everything else matches). Did the same company really decide to change its standard?! How do you know exactly what to connect where? PS I didn't find anything interesting with the multimeter... Best regards, Evgeniy.