Can we say that microevolution and macroevolution is fundamentally the same thing over different time scales?
You are mixing up two different things in your question: 


the mechanisms (processes) that cause micro- and macroevolution, and 
the genetic basis for different types of traits. 


The processes of evolution (selection &amp; drift acting on genetic variation) are the same for both micro- and macroevolution, and this what the Wikipedia article is stating. The second question is dealing with the amount of cumulative genetic change that is needed for different types of traits. This naturally differs dramatically between traits (the accumulated genetic change that is), and is also reflected by the different scopes of micro- and macroevolution. Macroevolution is usually studying problems above the species level, and therefore often larger morphological changes, while microevolution is dealing with smaller changes within species and populations. The macro/micro division is also artificial and should be seen as a continuum.