This is one of the most common 3 tones Rex Begonias that often flood the market.
Their features and similarities are very difficult to identify and define as the leaf colors changes according to the climate difference.
Regardless, these are all fall in one category called Painted Leaf Rex Begonia.
The dark deep black center with pink shades with white spots splashing across the green background with the same deep dark edges - You may not able to miss them.
I believe these are highland plants that requires cold climate atmosphere to retain the red hues.
I may be wrong.
This one is known as Cancun Christmas.Similar to Begonia 'Merry Christmas' but with more stronger white spots.
Begonia Common Names and Images
Here is the link where I had put together a list of all the begonias that I had come across. A database of all the different types & their characteristics. Please click on the link on the title above for the post.