You will be more tired for the one you do second
But it's fine to combine 2 programs, I guess one thing to keep in mind would be that when they make those programs they have in mind body rest and stuff since it's a daily thing, so depending on which days overlap (idk exactly what exercises then ones you mentioned have day by day) you might be more exhausted/overworked than intended. Naturally, none of this applies to programs with the add-on tag.
Bottomline, I don't think it will make you get stronger faster by stacking programs, might increase your endurance though, but you can still go for it especially if you think you can manage it, just listen to your body as you do.