Stash tab question sub account

Hi,
I got 2 account, one made on pc (accountA) and one made on ps5 (accountB) that i merged together.

I got 300 points on each sub-account.

So for now i only play with my account A on pc AND PS5, and i know that if i buy stuff on pc it wont appear on ps5, but if i buy stash tab on my account B on ps5 will it be accessible on my acountA on ps5?

Thanks.