No, they are not even related.
Online check-in starts:
First time cruisers: 75 days before sailing
Silver
Castaway Club members (1-4 completed cruises): 90 days
Gold Castaway Club members (5-9 completed cruises): 105 days
Platinum Castaway Club members (10 or more completed cruises): 120 days
Concierge cruisers: 120 days, but requests can be mailed 125 days before.
To access online check-in you must be PIF, even if your PIF date is after your check-in window opens.
PIF date:
Cruises 1-5 nights,embark or debark (or both) is in a US port:
Normal cruises: 75 days
Holiday cruises: 90 days
Suites and concierge all cruises: 90 days
Cruises 6-9 night, embark of debark (or both) is in a US port:
Normal cruises: 90 days
Holiday cruises: 105 days
Suites and concierge all cruises: 90 days
Cruises 10 night or longer and cruises with embark AND debark in a non-US port:
Normal cruises: 120 day
Suites and Concierge: 150 days
For cruises booked before 3-3-2015 other terms apply.