如图：

两处checkbox实现的文件位置：

screenshot of checkbox class in user-form.component.html:

screenshot for checkbox in unit-user-role.component.html:

html source code and css style for checkbox in user form:

html source code and css style for checkbox in unit-user-role html:

I have compared both, and no difference found between the two.

视觉效果上的差异：

: