With two near identical ones containing mixed race folk (asians, blacks, whites and browns) with blue and brown eyes in both ships and the other ships
containing humanoid, but not human bodied creatures I'd angle towards the first two.
Ascertain which ones are allied with God, JC and the angels, if none then say adios and turn around, shoulder your BOB, square your shoulders for a
long march to the wilderness and walk away, taking your merry band of survivalists with you.
However, if they all say 'we are' at once do a process of elimination:
Invoking the name of Jesus Christ, Mary, all the saints and God himself as authority for a truthful answer, ask the following question:
"Which ships race is the one that bore Jesus, Enoch, Ezekiel and Elijah to the heavens / safety."
The answer could vary, Jesus being the last of that list ought to be the deciding factor above all. Then, ideally, the rightful ship will then be
identified.
Walk through the door, hold your head high and await blast-off!
But, if more than one alien race still claim this (ie one is lying) and you cannot be 100% certain which one it is (due to the near-identical traits
and ways of them) then shake your head and depart.
It could well be the time is not right.
Start humming the tune to 'Show me the way to go home' as you amble back whence you came!