Difference in information returned by blockexplorer.com vs. blockchain.info?

I knocked together some PHP a while back to plot income at an address to a couple of graphs. As originally written, I grabbed income information from http://blockexplorer.com/q/mytransactions/addr. blockexplorer.com had a couple or three instances where they were behind the blockchain a fair bit, so I rewrote my script to pull from http://blockchain.info/address/addr?format=json. This source showed a drop-off in total income, which was of a little concern. Of more concern was that the total income never seemed to go up. To see what I mean, try these two links:

http://alfter.us/income.php?addr=1NgYDzGuHrJUmRSocfScYgBuGwsuvBB9Kz&src=1Baf75Ferj6A7AoN565gCQj9kGWbDMHfN9&simple=true
(uses blockexplorer.com)

http://alfter.us/income2.php?addr=1NgYDzGuHrJUmRSocfScYgBuGwsuvBB9Kz&src=1Baf75Ferj6A7AoN565gCQj9kGWbDMHfN9&simple=true
(uses blockchain.info)

Note that the second set of charts doesn't go as far back datewise as the first set. I thought these data sources were somewhat equivalent (they are formatted differently), but it looks like that's far from the case. It appears that blockchain.info doesn't dig as far back into the past; blockexplorer.com, AFAIK, returns all income at an address, going back to when the address first appears in the blockchain. Was I wrong to assume I'd get the same info from the two websites?

Topic: Difference in information returned by blockexplorer.com vs. blockchain.info? (Read 766 times)