Russian shuttles

A little bit off topic, but there were posted on english Russia recently.

I knew that two Burans were built (?) and one flew as an unmanned vehicle?

These two rather dusty shuttles have a some differences (one has a rather long nose)… any ideas??

Not much info given as to when the pictures were taken.

http://englishrussia.com/2011/09/07/a-baikonur-orbiter-under-reconstruction/