Remarketing ads question

I’ve been getting mixed answers on this and was hoping if someone could clarify this for me.

Lets say I sell two different private brands of products on my seller account. I created a campaign specifically for remarketing ads for my “Brand 1” products. In this campaign, I only have my “Brand 1” products added under “Ads” which is 285 ASINs. Then under targeting I have several different audiences.

My question is - do these only remarket to the ASINs I have added in the campaign under “Ads” or are these remarketing to ALL SKUs in my inventory? My worry is “Brand 1” gets remarketed to “Brand 2” or vice versa which is obviously a giant waste of money.