question on vista sp1 versions for download from msdn

none of the msdn groups have enought activity to ask this, so I will.

whats the difference between thes files:
en_windows_vista_business_with_service_pack_1_x64_ dvd_x14-56048.iso
en_windows_vista_with_service_pack_1_x64_dvd_x14-29595.iso

the second one comes w/ vista business included in it according to
it's info page.

so what's up?

thanks.

ps. the same deal is going on w/ ultimate version too.