The differences appear to come from two things, the fact that the charts cover different spans of time (1970 - 2006) and (1958 - 2008) and the fact that one of the charts contains more data points than the other (the '58 to '08 chart is less detailed). The fact that the one chart, which ends in 2006, does not contain the latest super-increase in the monetary base makes their comparison a bit misleading at first blush, as well.