Shabbos 79 – שבת עט

Rav Nachman maintains the quantity of leather which is not intended for tanning is identical to the one slated for tanning ‘kedai lasos kamiya’ – which is regarded as a significant shiur for the melacha of tanning itself; thus indicating that a tanned piece of leather of this dimension carries significance.  But why should the one that will not be processed have this same shiur?