您可以为每个控件创建两个单独的不同控件，然后检查它们是否具有相同的文本。

final passWordController = TextEditingController();

final confirmPassWordController = TextEditingController();
@override
Widget build(BuildContext context) {
  return Scaffold(
    body: Column(
      children: [
        SizedBox(
          height: 55,
          child: TextFormField(
            controller: passWordController,
            validator: (value) {
                // .... others validator
                if (passWordController.text ==
                    confirmPassWordController.text) {
                  return "password didnt match";
                }
            },
          ),
        ),
        const SizedBox(
          height: 15,
        ),
        SizedBox(
          height: 55,
          child: TextFormField(
              controller: confirmPassWordController,
              validator: (val) {
                
              // .... others validator
                if (passWordController.text ==
                    confirmPassWordController.text) {
                  return "password didnt match";
                }
              }),
        ),
        const SizedBox(height: 30),
      ],
    ),
  );
}