No it is not possible, the two are viewing entirely different worlds (The ‘play in editor viewport’ clones the world, so you can never accidentally corrupt your real copy of the game world).
However, you can use the Possess/Eject buttons to take control/leave control of your player controller. When ejected (or you start via ‘simulating’), you can move around the game world as if it were an editor world.
Cheers,
Michael Noland