the difference between i386 and i686

[snort bsd <snortbsd yahoo com au>]

hi all:

i am using rh8 and the machine ("uname -m") is i686.
there are a lot of upgrades for rh8; some for i386 and
some for i686. could i use them in mixed fasion, as
long as those rpm packages have the same version
number?

tia

_dave

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