Bihai,

According to Kirsten Llamas's book,"Tropical Flowering Plants", they are not. It says that 'magnifica' is distinguished from 'myriantha' by the conspicuous pink bracts.

No they aren't the same. Myriantha has smaller leaves, and smaller and less spectacular flowers/ berries than magnifica.

Medinilla myriantha seems to be often sold in the trade here as M.magnifica . Medinilla myriantha is used as a feature near the Post Office in Innisfail , massed plantings along 20m + of the road down to the river .Very impressive growing in full sun with just some shade from palms.

They are definately not the same and unfortunately, a lot of people sell them as the same. Magnifica is a much showier plant and alot more expensive.