Is this duplicate content bad practice? (E-Commerce)

Hello

I have just been reading this: https://support.google.com/webmasters/answer/66359?hl=en

I have 6-8 products that have the same content throughout. Only the keyword for the quantity has changed for the product, for example: "Buy 500 Red Tee Shirts" "Buy 1,000 Red Tee Shirts" but all products have the same content inside, just different numbers variations for my focused keyword (the number).

Is this bad for my SEO – Am I best moving all product variations into…

Is this duplicate content bad practice? (E-Commerce)