FTP client that supports 2 concurrent FTP sessions [closed]
If the servers supports it you can use the File eXchange Protocol (FXP).
FlashFXP supports FXP.
Total Commander allows multiple concurrent FTP sessions.
you can sync/compare files and folder and of course copy/move from one server to another.
Totall Commander is shareware, try before you buy.
You should try FTP Expert, best FTP software ever in my opinion.
It seems it is now called Ace Ftp.
Conduct server-to-server file transfers
Perform local-to-local file transfers
Open several FTP sites simultaneously