It appears that all three patterns were introduced in 1999, and were meant to co-ordinate with each other.  Sun Garden has a yellow crackle band on the rim of the plate, while My Garden is predominantly white.  My Garden Mix-N-Match adds a central decoration, and its most distinctive feature is a rope design circling the centre of the plate.

Bread & butter plates: Sun Garden (left), My Garden (right).

The cups, saucers and bowls for Sun Garden are identical to those of My Garden, and they do not have a yellow band.  It is uncertain whether there is an oval platter in Sun Garden, perhaps the My Garden platter was meant for both.  Corning Ware cookware and many accessories like cream & sugar sets were named after My Garden, but they suit Sun Garden equally well.

My Garden Mix-N-Match bread & butter plate.

Both My Garden and Sun Garden were available as complete boxed sets, but My Garden Mix-N-Match seems to be just an open stock item, and the only piece might be the 7¼ inch bread & butter plate.  Dinner and luncheon plates with this pattern have not been seen so far.

My Garden platter.

Back & front of cup matching My Garden and Sun Garden.