I bought a rooted plant late last year from BBB with plant tag Thai Mango Brush/Blush. I wonder if it is the sme plant.

Thai Mango Brush is similar to but not the same as Mango Blush. In my opinion the 'Mango Brush' is a superior cultivar.

I suspect that the mass-hybridizers in Thailand found something that looked enough like Mango Blush to name it the same, just misspelling the name; this of course happens quite a lot with translations.