Are you asking if you can use your current hardware when migrating to the A64 platform?
If so, that's what I initially did... used the RAM, hard drive, DVD burner, and floppy I had in my tower case and slapped them right into a SN95G5. Only purchases necessary were the Shuttle (of course) and a A64 cpu.
The same would apply if you are moving from a XP to a A64 Shuttle.