Try not to repeat the same word more than 3 times. Needs to match the above tables title's Meta Tag Keywords - List in order of importance . The first being the most important. Meta tag keywords vary slightly from regular keywords. It's safest to use both.
Identical list are fine.
Keep the description brief yet informative. Remember that a person will be reading this text and will decide whether to visit the site based on what they read. Remember keywords are not the focus here. The focus is to effectively communicate to a human what they can expect to find when they arrive at this page. If keywords can be utilized, use them but don't build the sentence around them.