Is there a Difference between the get/post request which receive from java script or HTML FORM submit

Or both look similar to the server and there is no difference whether request is generated by javasrcipt OR request initiated from FORM submit. 

Note : Please excuse me if i wasn't clear with my question. I'm not asking about difference between GET and POST. I'm asking about whether there is significant difference of the request between "FORM" submit and Javascript request which can be either get or post.