The basic purpose and construction of a literature review will be the same whether you are an undergrad or grad student. However, the length and depth of the review will differ.
Undergrads
Most likely you will be writing a Selective literature review as either an assignment by itself or part of a research paper. This means your instructor will probably specify how many sources will be needed for the review and may specify the types of sources required.
Grads
You may be writing a Selective or Comprehensive literature review by itself, part of a research paper, or for a longer thesis or dissertation. If Selective, your instructor may specify the number of resources required.
Please consult with your instructor to know what type of literature review will be required!