COMPARER DEUX PICTUREBOX C#

Bonjour ! Tout est dans le titre : je voudrais comparer deux images (contenues dans des picturebox). Je pensais à un genre de code comme ça :
if (picturebox1.image == picturebox6.image)
me.backgroundimage = my.resources.ciel

Pour ceux qui auraient besoin, voilà le code :

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace météo
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void tableLayoutPanel1_Paint(object sender, PaintEventArgs e)
{

}

private void Valider_Click(object sender, EventArgs e)
{
webBrowser1.Navigate("https://www.google.fr/webhp?sourceid=chrome-instant&rlz=1C1CHBF_frFR724FR724&ion=1&espv=2&ie=UTF-8#q=m%C3%A9t%C3%A9o+" + textBox1.Text + "%C3%A9&*");



}

private void timer1_Tick(object sender, EventArgs e)

{
pictureBox1.ImageLocation = webBrowser1.Document.GetElementById("wob_tci").GetAttribute("src");
label1.Text = webBrowser1.Document.GetElementById("wob_tm").InnerText;
label3.Text = "Précipitations " + webBrowser1.Document.GetElementById("wob_pp").InnerText;
label5.Text = "Humidité " + webBrowser1.Document.GetElementById("wob_hm").InnerText;
label6.Text = "Vent " + webBrowser1.Document.GetElementById("wob_ws").InnerText;
label2.Text = webBrowser1.Document.GetElementById("wob_loc").InnerText;
label4.Text = webBrowser1.Document.GetElementById("wob_dc").InnerText;
}
private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
timer1.Interval = 2000;
timer1.Start();
}

private void webBrowser2_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
timer2.Interval = 100;
timer2.Start();
}

private void timer2_Tick(object sender, EventArgs e)
{
pictureBox2.ImageLocation = webBrowser2.Document.GetElementById("image").GetAttribute("src");
timer2.Stop();
}

private void textBox1_TextChanged(object sender, EventArgs e)
{

}

private void textBox1_Click(object sender, EventArgs e)
{
textBox1.Text = "";
}

private void radioButton1_CheckedChanged(object sender, EventArgs e)
{

if (radioButton1.Checked == true)
webBrowser2.Navigate("http://www.cartesfrance.fr/meteo/");
if (radioButton1.Checked == false)
timer1.Stop();

}

private void radioButton2_CheckedChanged(object sender, EventArgs e)
{

if (radioButton2.Checked == true)

webBrowser3.Navigate("http://vigilance.meteofrance.com/");

if (radioButton2.Checked == false)
timer2.Stop();

}

private void timer3_Tick(object sender, EventArgs e)
{
pictureBox2.ImageLocation = webBrowser3.Document.GetElementById("cr").GetAttribute("src");

timer3.Stop();

}

private void pictureBox2_Click(object sender, EventArgs e)
{

}

private void button1_Click(object sender, EventArgs e)
{

}

private void webBrowser3_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
timer3.Start();
}

private void vScrollBar1_Scroll(object sender, ScrollEventArgs e)
{
}

private void textBox1_TextChanged_1(object sender, EventArgs e)
{

}


private void pictureBox4_Click(object sender, EventArgs e)
{

pictureBox2.Visible = true;
radioButton1.Visible = true;
radioButton2.Visible = true;
webBrowser2.Navigate("http://www.cartesfrance.fr/meteo/");

}

private void pictureBox5_Click(object sender, EventArgs e)
{
pictureBox2.Visible = false;
radioButton1.Visible = false;
radioButton2.Visible = false;
}
}
}