I am getting my grocery list ready for my Thanksgiving recipes and need a little help...

One recipe calls for 1 3/4 c half and half...another calls for 1c whole milk and 1 c heavy cream. Isn't half and half just half whole milk and half heavy cream?

Could I just buy all half and half and use 2c in the second recipe, or just buy whole milk and heavy cream and combine to make 1 3/4 c half and half for my first recipe?

Thanks for the help!