Basically, philosophers are sufficiently agreed on epistemology that both mean basically the same thing for the lay person’s understanding. There’s even a species of invariantism called “subject-sensitive invariantism” that is indistinguishable from contextualism to the uninitiated.
I’m not really sure why the distinction between contextualism and relativism makes a difference.
See here.
Basically, philosophers are sufficiently agreed on epistemology that both mean basically the same thing for the lay person’s understanding. There’s even a species of invariantism called “subject-sensitive invariantism” that is indistinguishable from contextualism to the uninitiated.