Difference between jam algorithm v33 and v59

In my company, we succeded to port Jam STAPL Player to DSP2812 to implement PLD upgrade years ago when using quartus 2.2.

We did in these way:

First, we created JEDEC STAPL Format(.jam) file by .pof files using quartus 2.2;

Second, we converted .jam file to .jbc file using jbc.exe v2.2 provide by Altera.

Now we upgrade to Quartus V11, and do it in the same ways with new quartus, but it failed to flash our PLD. The exit code is "6" which means unrecognized device.

We compare two .pof file, they are the same.

Then we compare the .jam files, they have big difference. And I noticed that the jam algorithm versions are different.

Quartus 2.2:

NOTE "JAM_VERSION" "2.0";

NOTE "ALG_VERSION" "33";

Quartus 11

NOTE "JAM_VERSION" "2.0";

NOTE "ALG_VERSION" "59";

Then I use quartus 2.2 to create .jam files with .pof files complied by quartus 11, then it can be upgraded successfully.

So i think this issue is caused by ALG_VERSION. Can anybody tell me what is the difference between them?