Are kidney cancer cells different from breast cancer cells and lung cancer cells?

Yes: All three can be classified as adenocarcinoma, but each has characteristics which let them be identified by the organ of origin.

Quite Different: These 3 different cancers are actually quite different. Under the microscope they look different, and the types of mutations they have are also different. As a result, the way the different cancers are treated are also different. Generally speaking for kidney cancer they would use targeted therapies or immunotherapies instead of chemotherapy or hormone therapy.