Default space difference?

i've wondered space difference between ipod touches on ios 5 , 4 when bought new.

know available space ios 5 6.4 mb 6.1 free when first seen on brand new ipod ios 5 preinstalled

same amount of space brand new ipod ios 4.x.x? available space , free space?

 

please reply if know, i'd find out

 

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