I saw a mahachanok tree in somebody's garden today, it had many mango's but they were still green. One had a pink blush starting but they all were in full sun.
In the shops they are mostly yellow, to find one with a pink blush you have to search, maybe 1 out of 10 has it.
That scion from the Royal mangogarden from the Thai King must be the real deal. Also the Thai Princess has many fruitgardens all over Thailand and at her palaces. In Chiang mai thailand is a big Doi Kham Royal farm which is open for public, there are many plants/fruittree's grown for demonstration/education purposes.