Merge two collections in Laravel if a key content is equal

I have two collections in Laravel 5.2. I want merge this two collection if the key design_name and name are equal.

$family_article_design = collect($list_config['designs']);

Collection {#311 ▼
  #items: array:1 [▼
    0 => array:2 [▼
      "design_name" => "blue edition"
      "tags" => array:5 [▼
        0 => "pokemon"
        1 => "pixelart"
        2 => "pokemon blue"
        3 => "pokémon"
        4 => "pokemon azul"
      ]
    ]
  ]
}

$list_designs = collect($list_designs);

Collection {#315 ▼
  #items: array:1 [▼
    0 => Design {#314 ▼
      #design_id: "72fws359rjgw"
      #name: "blue edition"
      #user_id: 0
      #article_id: 1728
      #application_id: 1028
      #popularity: 0
      #date_creation: "2016/05/17T22:59:49Z"
      #total_tags: 0
      #total_design_lines: 1
      #active: true
      #tags: []
      #permissions: []
      #design_lines: []
      #design_pages: []
    }
  ]
}

Something like:

if($family_article_design->design_name == $list_designs->name)
  merge($family_article_design item and $list_designs item)

I want this result:

Collection {#315 ▼
  #items: array:1 [▼
    0 => Design {#314 ▼
      #design_id: "72fws359rjgw"
      #tags => array:5 [▼
        0 => "pokemon"
        1 => "pixelart"
        2 => "pokemon blue"
        3 => "pokémon"
        4 => "pokemon azul"
      ]
      #name: "blue edition"
      #user_id: 0
      #article_id: 1728
      #application_id: 1028
      #popularity: 0
      #date_creation: "2016/05/17T22:59:49Z"
      #total_tags: 0
      #total_design_lines: 1
      #active: true
      #tags: []
      #permissions: []
      #design_lines: []
      #design_pages: []
    }
  ]
}

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