@val=({23=>1, 43=>1, 34=>1, 66=>1, 99=>1},{33=>1, 64=>1, 35=>1, 54=>1, 78=>1});;

pp \@val;;
[
  { 23 => 1, 34 => 1, 43 => 1, 66 => 1, 99 => 1 },
  { 33 => 1, 35 => 1, 54 => 1, 64 => 1, 78 => 1 },
]


$val[2] = { %{ $val[0] }, %{ $val[ 1 ] } };;

pp \@val;;
[
  { 23 => 1, 34 => 1, 43 => 1, 66 => 1, 99 => 1 },
  { 33 => 1, 35 => 1, 54 => 1, 64 => 1, 78 => 1 },
  { 23 => 1, 33 => 1, 34 => 1, 35 => 1, 43 => 1, 54 => 1, 64 => 1, 66 => 1, 78 => 1, 99 => 1 },
]