grub fallback mechanism

I'm trying to test a new kernel remotely so I would like to use grub's
fallback mechanism. I was wondering what is the difference between
doing using a config like this one taking from grub manual

default saved
timeout 10
fallback 1

title A
root (hd0,0)
kernel /kernel
savedefault fallback

title B
root (hd1,0)
kernel /kernel
savedefault fallback

or just this one

default 0
timeout 10
fallback 1

title A
root (hd0,0)
kernel /kernel

title B
root (hd1,0)
kernel /kernel

are these two configuration functionally different. Thanks for your
help.

Colin

.

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