yep there should only be 2 different ones for os9...
which is the "refill packer 1.0" for use with reason 1.0
and the "refill packer 2.5" which is for use with reason 2.0 + 2.5

im not sure if the refills made with packer 2.5 will be compatible with 1.0 aswell..
or perhaps its the other way around.. refills made with packer 1.0 may be compatible with 2.5
im not sure. these are the things i would like to explore + discover once all of the versions are located.

also im pretty sure the format is universal -- that is, its possible to create a refill for mac reason 1.0
with the windows 1.0 packer + vice versa for windows reason 2.5 with the mac 2.5 packer
etc etc

unfortunately i dont have the 2.0/2.5 packer for either mac OR windows  ;(
as u can see this topic began over 1 year ago...