Stock diffrence shoing in MB5B and LX03

Hi SAP Gurus,

Please help to explain what is the diffrence between transaction code LX03 and MB5B, I am seeing there is a stock diffrence between MB5B and LX03, the stock in MB5B and LX03 will be same or diffrent. And also help to explain table LQUA.

Thanks and Regards,

SHARAN.