These are both spotted lanternfly instars. There are four stages of instar before the insect reaches adult size. The red (left) is a more mature fourth instar and the black (right) is a younger third instar.
You are exiting the U.S. Fish and Wildlife Service website
You are being directed to
We do not guarantee that the websites we link to comply with Section 508 (Accessibility Requirements) of the Rehabilitation Act. Links also do not constitute endorsement, recommendation, or favoring by the U.S. Fish and Wildlife Service.