As you have to create a Net::SFTP::Foreign object for every remote server, just use the correct arguments for every host. 
$sftp1 = Net::SFTP::Foreign->new($host1, key_path => '/path/to/id_dsa'
+);
$sftp2 = Net::SFTP::Foreign->new($host1, key_path => '/path/to/id_rsa'
+);
...

[download]
You can also put that information on ~/.ssh/config (see ssh_config).

In reply to Re: Net::SFTP::Foreign key_path by salva
in thread Net::SFTP::Foreign key_path by KevinBr

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