zhāng (张) = measure word for flat things, like paper sheets and tables běn (本) = measure word for books

yī zhāng you can use it like yi zhang zhi meaning one piece of paper yī běn you can use it like yi ben shu meaning one book yi zhang use as to modify something is single and which can be used to make up something yi ben usually ues to modify a whole thing.

yi zhang is a piece of paper. yi ben is about many pieces of paper make up a book . my English is not good ,if you understand the words I write.It is my pleasure.

一张 a piece of 一张纸 一本 a stack of 一本书