Siyi (111) and Kimura Jinghong (mm) are both Japanese brands. Are they from the same company? Or its brand?

First of all, Four-One is a China brand, and its owner is Shenzhen Baqiannuo Trading Co., Ltd., as follows.

FOURONE_ Baidu Encyclopedia

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Kimura Jinghong is a Japanese brand. There are mainly three brands: Kimura Jinghong, K-3 and Yoshida Yoshida. The details are as follows

Kimura Jinghong _ Baidu Encyclopedia

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What you said has nothing to do with reality.