"of the same brand" is correct and usable in written English.
It can be used when referring to a group of similar products or services that have been created by the same company, manufacturer, or other organization. For example, "We purchased several items of the same brand to ensure they would be compatible with each other."
There are four or five coats of the same brand of paint on each canvas.
His clothes, of the same brand names as those that the other students wear, look wrong on him.
The paint and primer should be of the same brand because they are usually formulated to work together.
Shoppers who took part in the sampling were rewarded with a discount voucher to buy any jam of the same brand in the store.
With revenues falling, The New York Times looks in need of the same brand of cost-cutting that Mr Thompson brought to the Beeb.
Our local Costco sells an enormous hunk of Vermont cheddar cheese for just a little more than the supermarket charges for a modest piece of the same brand.
If you upgrade your computer and find there's no driver for your printer, search online for drivers that might be compatible for newer printers of the same brand.
Size matters If you've ever decided that one bag of crisps definitely contains more product than another of the same brand, then manufacturers would claim you are imagining things as all bags are portioned by weight rather than volume.
You might with similar logic stop by the Staples Center and present vendors with a bottle of the same brand of beer you drank at the Lakers game last night.
That the tours address player concerns about injury and quality of play by mandating use of the same brand of ball during each seasonal swing: one brand for the spring clay-court swing, another for grass, and so on.
Tire makers sell huge numbers of tires to automakers at very low prices that allow little or no profit, in hopes that customers will later buy replacement tires of the same brand at much higher prices.
