Color changed when importing self-defined components

Hi there! There is a problem when I import some self-defined components. The color is randomly changing when I import the components one by one. I have recorded the issue and the problem is shown in the gif. Could anyone tell me how to solve this problem? Thank you!

Just a guess, but maybe they define materials with same name but different color. Each loaded component would then overwrite the existing material with same name.

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