I must say that I had taken for granted thinking all of them are actually the same.
Little did I realize that even in these 'Red' Collection' there are many variations and cultivars.
This one - I had mistaken and considered the same with 'Inca Red'
Rather, it's actually Begonia 'Red Bull'
It has a bright metallic red coloration with a black spot in the center.
Also, it has a strong resembles of 'Harmony Pink Satin' but here the metallic red is evenly distributed rather than silver been spaced out. The black spot in center is the only thing that have the same resembles.
I'm pretty sure there are more varieties of these kind that will be introduced time to time in the market.
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.