DRV8353: What is "MOSFET drain sense pin voltage slew rate"?

Part Number: DRV8353

Hi team,

I have two questions as below.

Question 1:

My customer used DRV8323R and now plan to use DRV8350R.

And they found some difference in the datasheet. 

In 7.1, we can see the spec "MOSFET drain sense pin voltage slew rate".

May I know what MOSFET drain sense pin voltage slew rate is?

Question 2:

 DRV8323R's High-side gate drive pin voltage with respect to SHx is 13.5V but  DRV8350R's is 16V.

Low side gate drive is also different.

They don't want to change to MOSFET. Their MOSFET Vgs on =10V.

May I know if this will have some impact? 

And the gate voltage is bigger, what will it happen?

Thanks!