About updating to MM

So I noticed that sony released official 6.0 for our Z2, in my country we are not even updated to. 264( by ota and sony companion). So I want to update my device to MM via flashtool but all FTFs are for different countries. So I wonder which should I use, I'm afraid different countries fw may not compatible with my device. Since z2 is the very first high end device I own so I cant risk. Or can I just flash one of the ftf and exclude baseband, will that be ok? I have d6503 and a bit knowledge about flashtool

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