Minecraft, own account of other consoles, are the purchases saved?

I play Minecraft Bedrock on the Ps4 and would like to log in to Pocket Edition with the account I'm logged in with and buy something there. My question would be, will the purchases be carried over to the Ps4 (by using the same account) or will the purchases only stay on the respective console?

The first time you log in with your profile, you can set whether purchases are saved on the device or account. So it depends on what you've chosen. Unfortunately, I don't know out of my head whether you can change it later.