MSPM33C321A: about programming tool

Part Number: MSPM33C321A

Hi team,

One programming vendor is developing tool to flash M33C321A. Their tool is ok to program "MSPM33C321ASZAWR" (below the first picture). But, currently, they got newer chip "XM33C321ASZAWR " (below the second picture), their tool is fail to program XM33C321ASZAWR. 

M33C321A.png

 

XM33C321A.png

Please instruct what's the difference between these two kinds of chip. Is there anything their tool need to modify for the newer XM33C321ASZAWR ? 

Thank you.