Gi1/1
Gi1/2

Gi1/1
Gi1/2
Gi1/3

if($a -eq $b) {
    write-host "equal"
} else {
    write-host "not equal"
}

$a.ToString() == $b.ToString()

"System.Object[]" == "System.Object[]"

$a = @('Gi1/1','Gi1/2')
$b = @('Gi1/1','Gi1/2','Gi1/3')

If (($a -join '') -eq ($b -join '')) { 'Equal' }
Else { 'Not equal' }