Not in FED overtime. First and GOAL at the 16. See Page 86, 3.1.1 Sit Q.

NCAA: ball continues in play assuming it isn't dead otherwise. If Team B scores, the game is over.

Our O.T. procedure in Gerogia states that if B gains possession the series is over. Since this is a field goal attempt, the ball remains alive until the kick crosses the goal line or until it is otherwise down by rule, including recovery by B.

It does vary state to state. But doesn't the OT procedure indicate that each team gets one series? And if the FG attempt is still live, and A recovers the muff by B, A is awarded a new series. Do we say that A's series is over for that OT period? Or do we say that each team gets one series, unless a new series is awarded?

I think it would probably be better stated to say that A gets the ball until B is awarded a new series. Even though the wording of the rules would say there are a maximum of four numbered downs in a series the ruling in the back of the book says that first downs may be awarded for many reasons.

Under Resolving Tied Games in the back of the rules book.
During an overtime period each team has an opportunity for an offensive series of downs.

5-1-1 The team which next puts the ball in play by scrimmage following a free-kick, touchback or fair catch is awarded a series of four consecutively numbered downs in which to advance the ball to the line to gain. Each awarded first down starts a new series of four downs.

5-1-2
a. After a first, second or third down, a new series of downs shall be awarded only after considering the effect of any act during the down and any dead-ball foul by B.
b. After a fourth down, a new series of downs shall be awarded only after considering the effect of any act during the down, except a non-player or unsportsmanlike foul.

Then under the rulings under Resolving Tied Games in the back
5-2-1: The offensive team shall be awarded a new series of downs when any one of the following occurs:
a. Penalty for defensive pass interference is accepted.
b. Offensive team recovers a scrimmage kick (field-goal attempt) between the goal lines after it has been touched first by the defensive team beyond the neutral zone.
c. Defensive team is guilty of roughing the kicker, place-kick holder, snapper or passer.

So A may be awarded a new series even though the original statement about overtime says that there is only one series allowed (an offensive series of downs).