The primary thing one has to be careful of is not to accidentally wire the ends of the same cable according to different configurations (unless one intends to create an Ethernet crossover cable).

8.0 Which Specification is Preferred?

If 568A and 568B specifications are technically identical and both are international standards which one is preferred? The information here is sketchy and I have not received a response from many standards organizations, from what I can understand is that although 568B is widespread (especially in the USA) all new installations should be carried out using the TIA/EIA developed 568A. Standards Australia – The Australian equivalent the ISO says, "There is no reason to change existing 568B installations to 568A although all new installations should be implemented with 568A." More recent information, "As published in the EIA Commercial Building Draft 9.0 as the preferred sequence for termination of UTP data cabling… This is also the preferred option for AS/NZS 3080."

Although this crossover is called out in the Gigabit Ethernet standard[1], all Gigabit PHYs feature an auto-MDIX capability and are designed for compatibility with the existing 100BASE-TX crossovers. The IEEE specified Gigabit crossover is generally seen as unnecessary.

GigE uses all the pairs, but I don't know where I'd ever use a GigE in a crossover configuration... everything I've done in the last 10 years connect switches via fiber, not copper, and home stuff auto-connects.