it just lost the picture transfer function in the 7k Song Manager since the 2600 blue screen cannot play slideshows, but arguably adding to existing sd cards direct was a more useful function, and on the 7k pictures can be easily loaded direct from the sd card anyway rather than down the usb so not that much of a loss.
I supplied a kit with instructions to upgrade Song Manager to several people on the forums over the years in threads. I made it in such a way that you could go back to the 7k version if you wanted, or switch as many times as you like without affecting your original installation or start menu shortcuts which worked with either version.