BIND 9 and BIND 8 Transfers?

[Enrique Ayesta Perojo]

Hello, i have recently installed a new FreeBSD 5.3 RC1 to replace our internal 
cache dns master server, so it has installed BIND 9, on another machine we 
have currently installed BIND 8. Does anybody of you know if the transfer of 
zones between the two versions are compatible?

Thanks in advance