Brad, a cultivar is a particular plant within a species or hybrid which has been named. Usually this is done when a plant is awarded, or it may just be done when a grower identifies a particularly good specimen.
When the plant is cloned (or has keikis) all the resultant plants have the same cultivar name, showing that they are genetically identical to the original with that name.
When a plant is bread through seed it will not be genetically identical
even if it's bread from two parents of the same cultivar. Therefore a seedling can't take the parents cultivar name.
So this is a hybrid called Zuma Aussies Delight and any plant which has the same hybrids or species as parents, will have that hybrid name. 'Zuma Beach' is the cultivar name which means yours is either the original 'Zuma Beach' or a clone/keiki of it.
Ben's is therefore the same hybrid with the same species or hybrids as it's parents, but it's parents could be different individuals to yours or they could even be the same individuals as the parents of yours (especially as both cultivars have the same Zuma portion of the name) but yours is from a different seedling produced from those parents.
Hope that makes sence... not sure if my description is more confusing