This is my oldest holiday or zygo cactus, also known as a schlumbergera. It’s probably at least 20 years old. And despite the post headline, if you look at the bud and bloom shown together in this photo, you’ll notice that they are the same color.
The other two plants on this windowsill, not so much. The pale pink one that you see in this joint photo? Its early buds are white. It currently has no buds so I can’t show you that.
And these attractive pink buds look like they belong to my ancient 20 year old zygocactus, don’t they?
This is how they open.
So the moral of this story is to try to ensure that the plant you acquire has an open flower so that you know what you’re getting–unless you like surprises!
Gardendaze 
The pale pink looks almost white. I can not remember the last white one I saw. They must be uncommon.
That’s what I am thinking too. I have a couple of pale coral (also an odd color, but very pretty). And even a salmon colored one. It was only when I started writing this post that I realized that not only did I not have a white one, but I wasn’t sure I had seen one. Maybe they’re genetically problematic or something.
Karla