Welcome.newby. First, don't think I have ever seen a aftermarket stove control board.
Now, your first problem is, the "B" is a new series, and the aftermarket suppliers have not "stocked up" on the newer control board, as when they buy in bulk, get cheaper prices. Be aware there are available software updates for the B series, go to PP web site and learn about it.
Also, be aware, cheaper stoves are generally like cheaper cars, need more maintenance, and are more expensive to repair. Although, in the car market, that has shifted a bit, but not in the stove market.