Which is the best anki deck to use with my RTK 4th edition book?
I see lots of shared decks on the anki site but, a lot of them are for the 6th Edition. Will it hurt me to use one of these? If anybody can recommend a specific deck for me, I would be very grateful.

Just use the 6th edition cards to review or update the keywords in your 4th edition book as you go. I'm sure someone has a list of the changes. I doubt it's drastically different.

A lot of people end up customizing keywords anyway. So you using a 6th edition RTK deck doesn't really matter. You're reading from the book once, but then you'll be seeing the cards multiple times. It'll probably be useful for you to use the 6th edition version so you can have meaningful discussions with other people on this site.

Thank you, I will take your advice

Here is a list of added characters.

Thanks yogert909! dilema solved