Get count of not matching records mysql laravel

I am trying to get the count of the not matching records from two tables.

One table has records with leading 0(i.e 0199) and other have the integer values.(i.e 199)

DB::table('booking')
    ->whereRaw('booking_pdf.bid != booking.id')
    ->leftjoin('booking_pdf', 'booking.id', '=', 'booking_pdf.bid')
    ->count();

But didn't get the result. Also tried like this,

$bookList = DB::table('booking_pdf')->groupBy('bid')->pluck('bid');
DB::table('booking')
    ->whereNotIn('id', $bookList)
    ->count();

But because of leading 0 records, I'm not getting the proper count.

Where am I wrong?

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