Do you want to remove the elements from the first array? If yes:

@array2 = splice @array1, 0, 2;
# OR
push @array2, shift @array1 for 1, 2;
# OR ...
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If no:

@array2 = @array1[0, 1];
# OR
$array2[$_] = $array1[$_] for 0, 1;
# OR ...
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I'd use the first alternative in both cases.