Have you thought of examining the TCP timestamp field? Not necessarily for 
accurate uptime, but a way to determine if the hosts are the same.

Or some of the other fingerprinting methods? nmap has options for uptime and 
other fingerprinting : https://nmap.org/book/osdetect-usage.html

Of course, all this assumes the hosts are connected directly without any load 
balancing or some sort of firewall/proxy that fiddles with the packet data...

cheers, Jamie
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