why is the SCTR score different on NAK and NDM.TO the same company ?

Here's a link to the chartschool article on the details of how SCTR's work and how they are calculated.

http://stockcharts.com/school/doku.php?st=sctr&id=chart_school:technical_indicators:sctr

Simple answer is yes they are the same company but they are listed on different exchanges and are thus in different groups, TSE vs Amex. The SCTR number is a ranking within a specific group of stocks, TSE is one of the ranking groups available, the AMEX is not, thus there is only a ranking under the TSE symbol.