no. the two cpus have very different design and architecture even though they perform similar pc tasks.
in some tasks the core i3 (haswell and haswell refresh lineup) may perform better and in some others the fx6300 will outperform the core i3. if a task uses more than 2-3 cores e.g. 4-6 cores, the fx6300 will outperform the core i3. if a task uses 1-3 cores, the core i3 will have an edge.