Amiga 600 with kick 1.3, is it 100% Amiga 500 compatible?

[PanterHZ]

If in Kick1.3, how does he activate his hard drive from Workbench (Compact Flash)

This might be a solution: http://aminet.net/package/util/boot/kick13scsipatch
It does however involve burning a new Kickstart 1.3 ROM.

Here is a much simpler solution: http://aminet.net/package/util/boot/GetSCSI11
But have in mind that this is originally meant to be used on a A1200 that is softkicked to ks1.3, but who knows, it might work on other Amiga models as well. It involves grabbing scsi.device from kickstart 2.05 or higher, and then creating a boot floppy which can be used for patching the system with scsi.device upon booting it.