Generally, there is little variation in nutritional value between varieties ... Blanch and freeze cubes or slices of summer squash or grate and freeze Zucchini, unblanched for making Zucchini bread.
The zucchini, courgette or baby marrow (Cucurbita pepo) is a summer squash, a vining herbaceous plant whose fruit are harvested when their immature seeds and epicarp (rind) are still soft and edible.