Good visual excercise, but I am afraid you can't draw any firm conclusion.
Go back and overlap the chart of 1987's crash. It will actually look closer than the 29s period. AND if you overlap the chart of the Nikkei's crash from the 90s onward over the period started on Dec 07 for the dow, it will also look equivalent. Each chartist draws conclusions according to the charts used: the ones overlapping the Nikkei state we are deflating and in a long protracted period of zero bound rates which the government is fighting (reflating). Those overlapping 1987, believe the bottom is in place and after a flat 2009 we will slowly climb to new highs in 2 years time.
And yet those looking at 1929... well, those expect a depression. Regarding 1929, it took about 1 year to break the lows of 11/29 after the collapse of the Bank of the United States. By 1931 unemployment was at 15%. Some say current stock prices are valued at equivalent prices of 1931, yet unemployment today is not even half of that, arguing that prices are extremely depressed and not even justified. Many, many theories out there...