DRV110: what is the DRV1100 keep time tolerance

Tool/software:

hi team,

 I met  a problem,  the  Tkeep  is different  in  two samples，  the Ckeep is the same（I measured  with LCR） but  the solenoid  peak current keep time  is different； I exchange  the DRV110 chip  from one sample to annother， the keep time   follows  the chip； I want to know  how much  is the  Tkeep  tolerance  between  differnce DRV110?  thanks！

 sample 1：

sample 2：