Hi There! I personally wouldnt mix these two. We just installed a similar countertop and the shade of the background and the veins are so rare that I cant find anything that will look good on the backsplash. Im stock. I will attach a couple of photos for your reference. I think its risky to assume that the whites on both stones will match (even though it might feel ok when you look at samples). I hope it helps Good luck on the first photo the side wall and the top cabinet is white cabinet by Adornus

I can’t speak to the MSI stone, but we have the calacatta gold and really like it. It is very white and the veining is more subtle than the other fake marble quartzes we saw. It was expensive, but since we used it for our backsplash and counter we decided to splurge.

Just seemed to be a better white for us - as for the quartz I love the suede finish of the eternal Statuario but the fingerprints would drive me crazy. I had a sample in my kitchen and sure enough from every angle it was nothing but finger prints! I think the polished will be better for me to maintain - though I absolutely love the honed/suede look - looks more like marble for sure. I’m also worried about curry and turmeric staining - I’ve read that’s an issue and I like to cook a lot. Let me know what you end up with, will be fun for you to see all the whites! We had our kitchen designer bring them to our house so it’s all about the lighting too. You’ll like the cabinets!! :-)

I have Silestone Calacatta Gold for my kitchen countertops. I don't use turmeric or bottled ink so I can't comment on those stains. but the other items on your list, I just wiped up with a sponge. Don't know what would have happened if I had left them overnight, though. I did have a coffee stain that was left all day (from breakfast and didn't see till after dinner cleanup. Morning clean up is not too vigorous!). Cleaned up with a damp sponge. The trick with all surfaces and stains is to wipe up, clean off, or damp blot right away.