UCC21550-Q1: is it ok to leave the NC pin floating?

Part Number: UCC21550-Q1

Tool/software:

Hi team,

I'm Otis Zheng currently supporting EVTech, got a question from customer.

they were using UCC21550-Q1 with DWK package, and they need to change to UCC21550-Q1 with DW package, but the layout has been done and PCB board is done. 

is it ok for them to use UCC21550-Q1 with DW package, but keep the layout for 16pin version? with 2 NC pin floating? is there going to be any risk?

Thanks in advance.

Otis