Bobby- it is two completely different molds and two different companies. They obviously used the same sculpture for the 3 pieces, but the 'plug' (or whatever the proper term for the positive is) and molds were all together different, as the head tops are distinctively different between the speaker and the bucket/light. The bucket is a light head with the hole cut in it- the light has a guideline mark in it to show the line worker where to cut the hole. For the light version, they simply didn't cut the hole out, and cut a small hole for the clip light in the back of the head. Of course the speaker has a much smaller hole than the bucket, plus it has a lip or ledge molded in for the speaker to rest in and be screwed to.
Terry- Your headspeaker is THE headspeaker that Keith Sarno molded to make the resin repops everyone has (I thought you knew that). So all the repops around are casts of yours. He also did the paint/glue work on your speaker.
This one sold on eBay a little while back. It is a lighted head with a base.