Character names may be the same but macros, keybinds and other settings are stored within accounts. One way you can do it is manually copy your macros-cache.txt and bindings-cache.txt files from one account to another. These a located in
World of Warcraft\_retail_\WTF\Account\Accounts_Name\
for account settings and in
World of Warcraft\_retail_\WTF\Account\Accounts_Name\Server\Character
for character specific settings.