Can't Locate Images backed up with diffrent version

Hi,

I have backed up my database wil SQL agent 7.5 and now trying to restore this image succefully backed up on another SQL Server but by using Netbackup agent version 7.1 . but i can't see the image alreday backed up and i only can retieve the image using the same version 7.5

is it a backwards compatbility issue , or i can use 7.1 ??

thanks in advance