any of netinstall can be used?

*Hi, <http://cdimage.debian.org/cdimage/daily-builds/lenny_d-i/20070815-1/i386/iso-cd/debian-testing-i386-netinst.iso>
  If install debian testing with netinstall, can I use one from any date, or only the last one. <http://cdimage.debian.org/cdimage/daily-builds/lenny_d-i/20070815-1/i386/iso-cd/debian-testing-i386-netinst.iso> Can I use for example the debian-testing-i386-netinst.iso from 08/08/2007? <http://cdimage.debian.org/cdimage/daily-builds/lenny_d-i/20070815-1/i386/iso-cd/debian-testing-i386-netinst.iso>
*

thanks for help
bela

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