I love all dogs
but there is no way you can guarantee the color of morkies as adults...They all look different. Of course there are some that may look similar, but if you look at each of the pups even in one litter, they will probably all look different.
If you love yorkies, then I would say to get a yorkie from a reputable breeder who breeds to standard. If you want a maltese, then I would say to purchase a maltese from a reputable breeder.