Based on your photos I would stop things and do some investigating on the cabinets. They look too different, IMO, to be the same paint color top and bottom. It may delay completing the space, but it can be addressed now without so much problem. Later would be a big issue.

Stop every thing and have a heart to heart with the manufacturer and company your purchased them from and keep talking until you are happy. If you do not say anything no one else will either.

uhhhhhhh no!!!!!! Remove a door from an upper asap, set it alongside a lower cabinet and take a picture in good light and email them ASAP. That will eliminate them telling you "it's your lighting". Also, did you approve a "strike off" sample before your cabinets were constructed? There can BE DIFFERENCES IN TONE IN STOCK CABINETRY.. but the entire kitchen would be the same dye lot of paint. And yes..."off white" can go yellowy in certain lighting

Unfortunately it is the lighting. I have a sample slab. I moved it to the top and it changes colours. Now I don't know if it will all come together with paint, backsplash and countertops but right now it has me worried.

Is your lighting completed yet? Maybe change the color of your bulbs?

This is all natural light. I have no lights in yet. Also no blinds (still building)

The best way to compare colors is to take 2 doors off the cabinets (1 from top and 1 from bottom). Hold them side by side, preferably in front of the window, in natural light. This way you can tell if color matches or not.

Doors can be fairly easy removed from the hinges - depending on the type of hinge - the most you need is a screw driver.

The cabinets are all the same colour its all the lighting that comes in from the natural light. It touches some parts of the cabinet different then the other. I'm hoping it helps when the walls get painted backsplash is in and counters. I have already called the cabinet maker and they told me that due to it being the lighting that changes its colour they can't do anything for me.

I'm sitting in my living room looking at my off white cabinets.... One doesn't look yellow and one white. Something has to be off! Could it be a finish...? Has to be something!

Not sure what to do its a thermafoil product since that was the only option my builder gave me in a white cabinet. I took my door off moved it to the top where it looks more yellow and it matches then I moved it to the bottom where it looks more white and it matched up. If I would have known this would happen I would have went with my gut and done a charcoal cabinet. At least I would have gotten a solid wood product and could have painted it white down the road if I wanted.

I think when you get your backsplash and counters installed it won't be an issue any longer. There will be colour in between. Don't panic; you will end up with a great kitchen.

I would not use any more shades of white or any grey. Is the island a dark finish?

It might be the direction your windows are facing. Take a look at Rain by SW & Revere Pewter by BM on my tray ceiling. I have a bank of east windows & 1 west window

You can also have sun blocking film put on you windows to block uv Rays from your interior. Worth looking into?

The island is a charcoal. My walls are a skeptic general paint or a barren plain if your talking Benjamin Moore so I'm hoping that wall colour doesn't make it look any more yellow.