Do we need to make Thor with Stormbreaker and Thor with Mijolnnir?

Nope, stormbreaker is way more powerful than mjiolnir. And till Thor Ragnarok, Thor wasn't this powerful. After Ragnarok thor is country level, while pre ragnarok Thor is mountain level

Have you not been listening? You can add Storm Breaker and Mjolnir to any version of Thor when making a battle, hell, you can give Storm Breaker to Aquaman if you so choose, adding another character just to have a version with them wielding a weapon is unnecessary and counter intuitive.

Second of all, Thor wasn't amped by some celestial force, Thor has always been at that level, his Godly amp doesn't effect his base state, nothing has shown that to be the case, so dead that claim, Thor has always been Dwarf Star Level in his base state.