Does Champagne Ipe have the same durability as regular Ipe decking boards?

Yes it does. Both species are extremely dense and will last for decades. Both are more durable than traditional wood species like Cedar, Pine or Redwood. They can withstand the punishment of patio furniture, pets and barbecues much better than softwood can. If left untreated, it will fade to a silvery-gray color as it oxidizes. An alternative to leaving it untreated would be to put a coat of oil based stain like Penofin or SuperDeck to help maintain the natural beauty of the lumber and make your investment last a lifetime.