Ok Thanks. I tried this and i cannot log into both wordpress installations at the same time it just redirects to the one where the A record is pointed.
I usually use cpanel for the destination and it allows me to install wordpress on an existing wordpress domain but then when i try to login it redirects to the original site until i point the A record to the new ip but the i cant log into the original site.
When you say to use FTP Method do i use the migrate guru plugin for this?