I heard that pecan is healthier than Walnut. One of the reasons is that it has less Omega-6 per 100 grams, and ALA is an inefficient and therefore negligible form of Omega-3 fatty acid.
Pecan is called 美国山核桃 in China, which emphasizes that it is grown from the species in US (美国).
There are some species native in China, whose nuts are also called 山核桃. For example, this product is said to be from Changbai Mountain (长白山).
I was wondering if the Chinese species in Changbai Mountain is a closer relative to pecan than to walnut.
I am also wondering if their nuts are similar to pecan in nutrients, and also have less Omega 6 than walnuts.