Web-To-Lead

We have an ASP.NET form (Not classic ASP) on which we are posting data to Sales Force link provided inside the HTML generated from Sales Force website tool.

We are using the following parameters for production.

Oid=00D000000007kFV 

Campaign_ID=70130000000ISdy

HTTP Post URL = https://www.salesforce.com/servlet/servlet.WebToLead?encoding=UTF-8

When we use the sandbox url along with sandbox Campaign_ID it works fine but NOT on production.

We are posting the data by calling the Url with the field parameters(first_name, last_name,Etc) as Querystrings.

Something like the Url below:

https://www.salesforce.com/servlet/servlet.WebToLead?encoding=UTF-8&first_name=Sneha&last_name=Pawar&company=LB&industry=Media&title=test&email=Sneha@test.com&phone=&zip=&country=United+States&street=&city=&state=&00N30000005sZg8=Technical+Authoring+and+eLearning&00N30000005sZgD=test&Campaign_ID=70130000000ISdy&emailOptOut=True&oid=00DR00000007Smd&retURL=https://en-us.lionbridge.com/company/contact/thank-you.htm

Is my understanding correct for this statement? 

The OID for our SFDC Production org is NA1.   The Sandbox OID is CS2.