Marzocchi Z1, Z2 and BAM versions

In a nutshell:

Z1 - 100mm travel
Z2 - 80mm travel
BAM - 'Bomber Aerospace Material', Marzocchi's name for the aluminium used in a Bomber fork.
 
so all the Z1 and Z2 are BAM?
Difference between Z1 and Z2 only in travel or in technology too? i see the weight difference is a bigger amount than in it?
 
I'm pretty sure that Marzocchi started using the 'BAM' terminology in 1997, for the '98 range of forks.
 
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