Here's why:

* Budding is an asymmetric form of cell division. Unlike binary fission, where a cell splits into two equal halves, budding involves a smaller "bud" forming on the surface of the parent cell. This bud then grows and eventually detaches, becoming a new cell.

* The bud receives a smaller portion of the parent cell's cytoplasm and organelles. This means the daughter cell (the bud) and the parent cell will have slightly different amounts of these components.

* The distribution of genetic material (DNA) might also not be perfectly even. While the goal is for both cells to receive a complete copy of the genome, slight variations in the distribution of chromosomes can occur.

* Environmental factors can influence the daughter cell's development. The environment the bud develops in, including available nutrients and signals, can influence its growth and differentiation.

Therefore, while the parent and daughter cells are genetically similar, they are not identical. This is particularly important in the context of cellular differentiation, where budding can lead to the creation of cells with specialized functions.