Just like most Dieffenbachia hybrids names - they all look similar and have slight variations.
This could be Dieffenbachia 'Tropical Tiki' or Dieffenbachia Memoria corsii.
Dieffenbachia Memoria corsii has more greener appearance in comparison to 'Tropical Tiki'.
How both have it nice sprinkles of white dots and even when its kept in shade when the whole foliage turns more greener - the white dots are more prominent.
The common appearance of a ariod species inflorescence - the spadix and spate.
Somehow the beauty of it is so similar like a peace lily. I have read somewhere that is good to prune off the flowers for the plant to concentrate it's energy on plant growth rather than the blooms, especially it can take it toll on them and weaken the plant as it may attract pest on them and stressing the plant with unwanted attack.
The grey colored appearance visible in semi shade, (pic above)
when placed in bright shade it appears more light green. (pic below)
How to Care & Cultivate Dumbcane Plant:
Dumbcane - Dieffenbachia - Best Indoor Plants