DS15BR401: No connect pin for replacement DS90LV804

Part Number:DS15BR401

Please let me confirm about NC pin of DS15BR401;

【Background】

・At first, customer is designing DS90LV804, but they realized that termination resister should put external.

・Most compatible and external termination resister IC is DS15BR401, but below pins are difference.

　DS90LV804　DS15BR401

　1：GND　 　　：N/C

　17：GND　　　：N/C

　18：GND　　　：N/C

　19：VDD　　　：N/C

　22：VDD　　　：N/C

・Customer is already made circuit board, they can't big change and want not NC pin left open.

【Question】

①Are these NC pin perfectly no connection from internal DS15BR401 circuit? 

②About 19pin and 22pin for DS15BR401, are these pin should connect VDD?

　I think that GND connection is no problem, is it correct?

③Just in case, are 1pin, 17pin, and 18pin connect to GND no problem?

Best regards,

Satoshi