What were the main differences between the Russian Revolutions of 1905 and 1917?
The foremost difference is that the 1905 failed while the 1917 succeeded. The 1905 seems to have been unplanned, beginning with a mutiny aboard a Black Sea Fleet battleship, and the 1917 was both planned and well coordinated according to Marxist doctrine. Both revolutions happened in proximity with Russian wars, but the war with Germany was likely more devastating for the Russian people than the war with Japan.