Is this the same plant or 2 different types of hydrangea plant?
Rjinga, I think you're being confused by someones use (misuse) of common names - it's hydrangea macrophylla Nikko Blue. The macrophyllas are often referred to as Lacecap, Bigleaf, French, Mophead....in this part of the country at least 'snowball bush' is a viburnum and there is no viburnum Nikko Blue.
after doing further research on TN Nursery (wholesale nursery also known as D&T) I guess I should not be surprised..
here is how their website lists this plant. which merges both terms into the description...I checked them out on daves garden, garden watchdog, and it was pretty bad reviews.
nikko blue Snowball Bush Hydrangea macrophylla Nikko Blue ('Nikko Blue; Hydrangea) The Nikko Blue Hydrangea has blue blossoms on a plant with a strong constitution which make Hydrangea macrophylla Nikko Blue' one of the best
Hydrangeas Hydrangeas produce some of the biggest and most beautiful flowers in the garden. New England is probably the hydrangea capital of the world. Take a drive through Cape Cod on a summer day, and most likely, you will witness a fantastic array of show-stopping hydrangea blooms. Types: The LaceCaps Lace Cap hydrangeas are large leafed varieties with flat flowers. The flowers are small in the middle and around the outside they have larger, Â¾ of an inch size flowers with four petals. This is type of hydrangea often seen Cape Cod. They prefer morning sun and afternoon shade, but will tolerate full sun or as little as 3-4 hours of sun. Popular Lace Cap varieties: ÂLace Cap ImprovedÂ Â Large growing to about 4-5Â tall and 3-4 wide. Flowers range from pinkish-purple to blue.
I've seen macrophylla's referred to as "snowball bushes" usually by places that don't bother to list hardiness zones let alone latin names!