Not the same thing.

One, the raw materials are different

1, raw flour raw materials: raw flour used in the mainland is potato flour, raw flour used in Hong Kong is cornstarch, while in Taiwan the customary gravy powder is tai bai powder, which is made from potato or cassava.

2, corn starch raw materials: starch extracted from corn kernels.

2, belong to different

1, raw flour: including corn starch, tai bai flour, sweet potato flour, kudzu flour, tapioca flour, west valley coconut starch, crystal flour, mung bean starch.

2, corn starch: belongs to a kind of raw flour.

Extended Information:

Cornstarch with water has a strange property: it hardens on rapid impact, but not on slow impact. After mixing cornstarch and water at a weight ratio of 3:2, the shear-thickening fluid, a shear-thickening fluid called "oobleck," cornstarch has many uses in the production of environmentally friendly products.

For example, in 2004, Japan's Pioneer published a Blu-ray Disc made of corn starch that can be naturally degraded.

Baidu Encyclopedia - Raw Flour

Baidu Encyclopedia - Corn Starch