Magnese content in Matcha Powder

So the generic Matca Powder listing does not list Magnese contents of the food item, but the generic Green Tea, Brewed listing does list a large portion of Magnese. Given that Matcha Powder is just ground Green Tea wouldn't it follow that everything in Green Tea is also in Matcha Powder, including Magnese?

I worry about this because with my Turmeric, Paprika and Curry blend spices -- along with the rest of my diet (quinoa, kale, chard, Kashi golean original, cauliflower, broccoli, eastern oyster, bok choy and chia seeds -- all high in magnese to the point of 8.4mg/day not including any from matcha green tea powder) I could potentially overdose Magnese if Mathca Powder has as much magnese, or more, as brewed Green Tea. i have about 2 cups per day of the green tea powder currently. So, I need to find out so that I can adjust my diet to avoid magnese overdose/toxicity.

The Brewed Green Tea listing shows 0.4mg of magnese per cup. So if Matcha powder is more than that, i could be in a little bit of trouble. Any help is appreciated.