Same Rocket League account on Ps4 and Switch?

I always play Rocket League on Ps4 and also have an inventory which is worth about 50 keys And I bought Rocket League for my Swich.

That's why my question now is whether I can use the same account on Ps4 and Switch (ie my 50 key worth inventory on the swich have).

If anyone knows or finds something please write me or give me tips…

I think that should work as long as the game uses crossplay between the two platforms. If it should do that, then simply log out / log out with the account and then log on to the switch. If it does not support crossplay, it probably will not work.