Get the value sent from a first form and show it in another

I have my form where I register user data with the first and last name fields and it works perfectly; I also have another form with the same fields so that I receive the data and it also works. Now, in that same form I also have a <h4> tag where I want the data sent ( nombre ) of my first form to appear, but it does not appear. I do not know what I'm missing. I appreciate any help.

I want it to appear here:

<p></p>
<h4></h4>

This is my first registration form: With this code I send my data .. (if it works .. if it sends)

sendUserCliente(id, value) {
  this.authService.getById(id).subscribe(res => {
    this.userGet = res;
    const cliente = new Cliente(value.firstName);
    console.log(cliente);
    this.router.navigateByUrl('/cliente/carga/detalle-de-carga');
  }, err => {
    console.error(err);
  });
}
this.myForm = this.fb.group({
  empresa: [
    null,
    Validators.compose([Validators.required, Validators.minLength(3), Validators.maxLength(40)])
  ],
})  

First form

<form [formGroup]="myForm"   (ngSubmit)="myForm.valid && sendForm(myForm.value)
                    " novalidate class="form-horizontal">  
    <div class="form-group has-feedback">
        <input
              type="text"
              id="firstName"
              class="form-control"
              placeholder="Nombre"
              formControlName="firstName"
        >
    </div>
</form>

Second form

This is my second form where I receive the data of the first form, but in my h4 I do not see the data registered in the first form.

    <form [formGroup]="myForm"   (ngSubmit)="myForm.valid && customerUpdateForm(myForm.value)" novalidate class="signup-ademia-formulario-general">
     <div class="form-group has-feedback">
        <input
              type="text"
              id="firstName"
              class="form-control"
              placeholder="Nombre"
              formControlName="firstName"
        >
    </div>
</form>
<h4 id="firstName"></h4>

With this code I receive the data of the first form

customerUpdateForm(value: Object): void {       

    const user = new User(
        this.myForm.value.email,
        this.myForm.value.password,
        this.myForm.value.firstName,        );

this.myForm = this.fb.group({
            empresa: [null , Validators.compose([Validators.required, Validators.minLength(3), Validators.maxLength(40)])],
        },)  
    }

This is the code that I use for both and it works for me since I register and I receive the data. Now I want the data of firstName to appear in the h4 but it does not appear, I do not know what code I should put.