You get the ProjUID in url this way:geturlparameter.txt
Which way do you use to link to the next page?If there is no relationship between the two pages, it is difficult to pass parameters between them.If you use 'a' tag or js function to link to the next page,you could append ths ProjUID got from current page to the newForm url,like
http://sp/Lists/test/newForm.aspx?ProjUID=0cf684d4-0fe3-e93d-1e25-d193dca4aa33
Then you could get the ProjUID in newForm page with the above script.