Where I live (which uses the NBR 14136 standard), the 20A plugs and sockets look identical to the 10A plugs and sockets, the pins and corresponding holes are on

Where I live (which uses the NBR 14136 standard), the 20A plugs and sockets look identical to the 10A plugs and sockets, the pins and corresponding holes are only slightly larger (so that a 10A plug fits on a 20A socket, but not the reverse).