The Cat 5e jacks will work with Cat6 but the Cat6 will only function at Cat5e level. Usually the 110 punchdowns are color coded so you shouldn't need any wiring guide. Just wire both ends according to one of the standards -568A or 568B. If you make a cable with 568A on one end and 568B on the other, you create a crossover cable. This isn't what you want.
My Project - I am wiring my house with CAT6 cable, due to increasing bandwidth needs, I decided CAT6 would be best for future applications.
I bought CAT5e keystone jacks, assuming they would work (that and at the time I couldn't find CAT6 keystone jacks anywhere, so I just figured they were one in the same). I already opened the keystone jacks, so returning them is out of the question. Can I still wire a CAT5e keystone jack with CAT6 cable? Do you know where any wiring guides are? I can only find guides for wiring CAT5e into a keystone jack. Also, I don't understand this: on the keystone jacks, they have 2 options for wiring - 568A and 568B. What does that mean? I am under the assumption that one is straight through and the other is crossover, but if I'm wrong then please let me know.