1972 Penny WAM Or Cam...?

Your chart is from a source that has no clue what they are talking about.

The whole " Wide AM" and " Close AM" thing starts with the design that made its debut in 1989, and the first known example of an incorrect reverse on a coin is 1992.

All known coins to date used only one reverse per year until 1992. So if you want to know what's normal for a 1972 cent, grab any one of them and look at it. What you will see is the normal 1972 reverse.

A 72 cent isn't going to be significantly different from, e.g. a 71. I don't think the term WAM or CAM should even be applied prior to 1989, and prior to 1959 it would have the wheat reverse instead of a memorial reverse, so it would make even less sense. If you want to categorize US cents by reverse design variety, you might want to look at this.

Just so you know there also can be difference spacing between the letters due to die wear/deterioration.