I am looking in the APM Agent Guide and unable to find APM 10.7 information. Am I looking in the correct place?
The Agent Guide does not say that APM 10.8/2x.x Agents are equivalent.
APM 10.7 agent information is part of the APM documentation, and the search functionality works as it does for another version/product. From APM 10.8 onwards, the agent's documentation was decoupled from the main APM documentation. You may not be able to find 10.7 content in the agents-only documentation.
For the 2x.x/10.8 agent's documentation, the link is the same but there are differences in content and there are added notes wherever it is not common.