Should I use two components for edit and create form in angular?

you could create one common form component, that accept @Input is a FormGroup, then create Edit and Create form, setup form (edit form will have values), passing your form to common form component:

Common

@Component({
  selector: 'tpc-cm-form',
  template: `
   <div [formGroup]="formGroup">
    <input formControlName="example" type="text"> <br>
    <textarea formControlName="sectionContent"></textarea>
   </div>
  `
})
export class CMForm {
  @Input() formGroup: FormGroup;
}

Create

@Component({
  selector: 'tpc-cr-form',
  template: `
   <form [formGroup]="form">
    <tpc-cm-form [formGroup]="form"></tpc-cm-form>
   </form>
  `
})
export class CreateForm {
  form: FormGroup;
  constructor(private fb: FormBuilder) { }
  ngOnInit() {
    this.form = this.fb.group({
      example: '',
      sectionContent: ''
    });
  }
}

Edit

@Component({
  selector: 'tpc-ed-form',
  template: `
   <form [formGroup]="form">
    <tpc-cm-form [formGroup]="form"></tpc-cm-form>
   </form>
  `
})
export class EditForm {
  form: FormGroup;
  constructor(private fb: FormBuilder) { }
  ngOnInit() {
    this.form = this.fb.group({
      example: '',
      sectionContent: ''
    });

    // fetch data from API for example
    this.form.patchValue({
      example: 'Simple data',
      sectionContent: 'Content textarea'
    });
  }
}

online demo: https://plnkr.co/edit/NWgzGdUc9cDkKujPgrl4?p=preview