YES - indoor cats can catch diseases from outdoor cats, regardless of
whethere the outdoor cats have been vaccinated or not, they could be
'carriers' (research "Typohid Mary" for more info on 'carriers').  Please
make sure that your Kuwaiti-bound friend's cats are up to date on all shots
(for outdoor & indoor diseases, as well as wormed, etc.), before expeosing
the different sets.

Also, since your friend's pair is declawed, please try extremely hard to
make sure that they do not get outside (and they will probably try to, once
they see yours coming & going), as they are have lost one of their major
defense modes.

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YES.

Some viruses can be carried by vaccinated cats. And not all vaccinations are
100% effective. Many vaccinations against viruses are not 100% effective at
preventing infection, but serve to moderate symptoms.

Not to mention parasites, such as fleas, worms, and ticks, that may be
brought in from outside.