Does a color change in the worker bees mean they have changed their queen?

Early this spring, the very first bees were striped and looked like Italians. (They are feral bees). Then, they changed to mostly gold, with just a little black near the stinger end of the abdomen.

Well, now they have stripes again! It started out with just a few having stripes, now they all do! I saw a few drones not too long ago, they are black or mostly black.

Do you think they changed queens TWICE this year???? I have never been able to find the queen, so I cannot just look at her and see if she is different! I know she is in there somewhere, because of the young bees and brood, but she sure is hard to find!