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Questions about the replacement of LTC2444


I have already started mass production with LTC2444, but due to the difficulty in availability, I'm considering a running change

to LTC2448 or LTC2445. Then I have two questions.

1: I will not use the analog input pins (8,9,11,12,15,16,19,20,23 pins) of LTC2448. In this case, is it OK to leave these pins unconnected?

2: The MUXOUT and ADCIN pins of LTC2445 will not be connected, is there any way to connect the output of the multiplexer and the input to the AD converter inside LTC2445?