This could be a number of things! Why do you need to know? Even if you were to find this exact counter, the current lot would not be exact anyway.

I do not like the quartz that is on my perimeter. If I can identify the quartz on the island, I could switch the perimeter to match it. Otherwise, I will either live with what I have or replace all of it with something else.

You do know it is man made so a real match might never happen What is the perimeter counter ? For me that counter you show would be gone it looks so fake . If you love the island counter why not just do a simple one color permiter in corian like the veins in the island We do need pics of the other counter to really help BTW so post that pic here ina comment DO NOT start another post

This is the quartz on the perimeter. I really don’t like it.

The perimeter quartz design has far more staying power long term than the big dramatic veining that is well on the way out. I would ditch the island first if you want to make changes.

Your perimeter looks something like Caesarstone Nougat:

https://global.caesarstone.com/catalogue/classico/6600-nougat/

If that's right, I'm guessing that the island is also some kind of Caesarstone quartz so you might look at what they have. I see several that might, sort of, be a match, but it's hard to say for sure. I think replacing it all to something you like will be a better bet if you hate the perimeter, but the perimeter is pretty neutral and sometimes a countertop that fades to the background is a good thing.

Caesarstone Calacatta Maximus

Caesarstone Circa 503

Being home samples anyway. You have to see countertop materials in your kitchen lighting. Would a medium gray be in consideration?

Thank you all for your feedback , it is appreciated. ❤️