compare 2 captures in wireshark

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You should look into the Syncro plugin by Tribelab.

Essentially you run two instances of Wireshark and when you move around in one instance in Packet Details, the scrollbar/packet marker in the other instance moves with it. This means you can easily correlate the two captures for faults, missing packets etc.

Please note that it requires you to install a DLL that essentially opens sockets on your own machine, which may or may not be allowed if you have strict security rules. E.g. I'm not able to do this on my company laptop which is a real pain.

https://community.tribelab.com/course...

It's very nice.

Compare is a rather generic term. But what you can do is merge the two capture files and then look at it.