Identifying FR-4 and G-10
The top one looks like a cheap paper-based phenolic board eg. CEM-1/CEM-3. The outline and holes appear to be punched, which is very common for low end consumer products and power supplies. It punches fairly nicely under the right conditions, is cheaper and wears the tools less than epoxy-glass laminates. 

Eg. Nan Ya Plastics CEM-1-97 

The bottom one looks more like epoxy-glass such as FR4. 

You can test for UL94V0 with a Bunsen burner following the procedure.  Basically it's not supposed to keep burning (much) after the flame is removed.