Unifying partial between BlockGridItem and BlockListItem

block.cshtml

@inherits Umbraco.Cms.Web.Common.Views.UmbracoViewPage<IBlockReference>
@using Umbraco.Cms.Web.Common.PublishedModels
@{
  var block = Model switch
  {
      BlockGridItem gridItem => gridItem.Content as TextBlock,
      BlockListItem listItem => listItem.Content as TextBlock,
      _ => null
  };
  
  var settings = Model switch
  {
      BlockGridItem gridItem => gridItem.Settings as TextBlockSettings,
      BlockListItem listItem => listItem.Settings as TextBlockSettings,
      _ => null
  };

  if(block != null){
    <div class="textblock">
      <h1>@block.Title</h1>
      <div>@block.Text</div>
    </div>
  }
}

Awesome thanks.

For future noobs like me, put @using Umbraco.Cms.Core.Models.Blocks; at the top (unless there is some global way of doing it - note the "noob" clarification from earlier).