Identifying whether 2 IPs are from the same server

Hello,

I am doing a Penetration Testing for 2 IP addresses.
My findings till now for both the servers are exactly
same. I strongly feel that both the IPs belong to the
same machine. May be a scenario where two NICs are on
the same machine with two Public IPs. I ran HPING to
match their IP IDs but it shows different series for
both of them.

Is there any other technique that we can use to
ascertain such a situation?

thank you



                
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