the cross itself for some of these are confirmed but there is a percentage or RNG that determines if you get a seed or not. So Prickly pineapple and Honey lemons will always produce a Apricot seed as long as the RNG is met. You will not get another type of seed from this, or should not from what I've seen so far. There are some plants that can act as a mother/father though (produce seeds and cross breed) so getting 6-8 sets of seed are possible. There was also a note during a patch release that mentioned certain soul can increase the number of seeds obtained. Although Im not sure it includes G5 seeds like glazenuts/jute or broombush