Sandbox has some extra fields in file generated by CrmSvcUtil.exe

Hi,

I have a sandbox instance which is a copy of production. However, when I use a customization comparison tool, I can see that it says that there are extra fields in the sandbox. However, these fields are indeed in both production and the sandbox. Then when I generate Xrm.cs for the sandbox using the CrmSvcUtil.exe tool, there are a lot of discrepancies in the sandbox file when compared to the existing production version, example below. How could this happen? I didn't update the field below.

Are differences such as this one outlined below something to be concerned about? There are extra attributes in the sandbox version. Could I just manually copy over the code for the new fields which I have added?

THANKS!!

SANDBOX
/// <summary>
/// Type the account's website URL to get quick details about the company profile.
/// </summary>
[Microsoft.Xrm.Sdk.AttributeLogicalNameAttribute("websiteurl")]
public string WebSiteURL
{
	get
	{
		return this.GetAttributeValue<string>("websiteurl");
	}
	set
	{
		this.OnPropertyChanging("WebSiteURL");
		this.SetAttributeValue("websiteurl", value);
		this.OnPropertyChanged("WebSiteURL");
	}
}EXISTING PRODUCTION VERSION	
/// <summary>
/// Type the account's website URL to get quick details about the company profile.
/// </summary>
[Microsoft.Xrm.Sdk.AttributeLogicalNameAttribute("websiteurl")]
public string WebSiteURL
{
	get
	{
		return this.GetAttributeValue<string>("websiteurl");
	}
	set
	{
		this.SetAttributeValue<string>("WebSiteURL", "websiteurl", value);
	}
}