Hold on there. I have noticed that there is definitely a disinhibition effect from doing heavy snatches. This effect won't generally help you press heavier, but it will potentially add reps with a weight you can already press. For example, at one point about eight years ago I snatched 100 reps with 32kg in 5:00. After catching my breath and resting 10 minutes, I banged out high reps of presses with 32kg on each side, 6-7 each, crushing my PRs. This seems to be some kind of immediate effect rather than a long-term training effect, maybe a stress response.