I think you should each go on what you are each happy on.
The advantage of same bikes is that you can cut down on the number of spares to be carried. You can also check one against the other if something serious goes wrong.
Differing models (and makes) of bikes might increase the number of 'essential' tools to be carried between you, but probably not by a lot.
My other reservation of sharing too much equipment and tools is what to do with it, and who takes what, if you fall out with companions and decide to split and go different ways. This is something realistic to be considered as people do change under difficult conditions. Being your Fiancee I trust this will not happen..
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