I guess ive made enough things to say a little somethine here too, I've avoided using copypasta in my articles even from my own other articles and stick to rewriting it within its new context so it ends up being similar but not identical. I can understand people wanting to save time an effort by using pre existing descriptions of "standard" bits and pieces, but I'd like to refer to my days of primary and highschool.
If the intention of the new article is to be an improvement piece or copy piece then quote the original, if it's your own work inspired by the original then rewritie it in your style but keep key points such as perhaps, dimensions or structure.
I know it's not much and I'm not sure if we have a quoting guide for wiki articles but, i think there's nothing wrong with copying or being inspired by other articles, just rewrite the sections a little bit and maybe mention if it's supposed to be IC inspired.