Unfortunately no, but it is a good sign. The mating ritual is not just about sex, it also can be about dominance. The one on bottom is accepting the dominance of the one on top, whether willingly or by force. I’ve seen a hen mount a pullet to demonstrate dominance when there was not a dominant rooster in the flock. I’ve never seen a cockerel mount another cockerel but some people on this forum that I trust say they have.
It’s still a really good sign, especially if the one on bottom did not put up much of a fight. The mating ritual often is about sex.
Since it can be a dominance issue, it does not necessarily mean the pullet is ready to lay, if it really is a pullet. But again, it is a pretty good sign you might get an egg pretty soon. Make sure your nests are open and put a fake egg in to show her where to lay. I like your odds of seeing an egg pretty soon.
Good luck!