When I download a file from this link by Firefox its size is 74580 B, But when I download it by curl with exactly all of header was sent by Firefox its size is 79891 B (I copied all header from Firefox and paste it in curl command). what is the problem?

If you need any additional data ask me in comment.

My curl command:

curl --header 'Host: members.tsetmc.com' --header 'User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:29.0) Gecko/20100101 Firefox/29.0' --header 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8' --header 'Accept-Language: en-US,en;q=0.5' --header 'Referer: http://www.tsetmc.com/Loader.aspx?ParTree=15131F' --header 'Cookie: ASP.NET_SessionId=pwzbckbdpjlzqj45vcdbd455' --header 'Connection: keep-alive' 'http://members.tsetmc.com/tsev2/excel/MarketWatchPlus.aspx?d=0' -o 'MarketWatchPlus-1393_3_14.xlsx' -L