I was told by a guy from a Melbourne timber yard that deals with exotics that Ambrosia is just Enlgish grown maple. Same tree. The English decided to rename it. So if thats true (I've never bothered to research it) then this top is spalted maple, grown in England, which because of the climate difference, height above sea level difference etc eta, the timber will appear different. I assume RAD already knows this as he listed "Ambrosia Maple" in the specs, so I'm more commenting towards others that are unaware.
For example. Take Australian Blackwood. Tassy, Vic and Qld blackwood are all different. Yet they are the same tree. Different locations/hights and climates turn out different colored timber. Tasmanian is the most sought after, the darkest, grown in more rainforresty locations. Vic is located in the middle of Tassy and QLD and the timber is in the middle of the darker tassy and the lighter more plain QLD blackwood.