Is Caustic Soda & Caustic Potash the same thing ?

[NedKelly]

I have checked the search engine , there are many referenes to both these chemicals , but knothing stating weather they are the same or can be used instead of each other.
Im looking at converting safrol to isosafrol

[Chewbacca]

Soda, sodium
Potash, potassium

Caustic Soda is NaOH
Caustic Potash is KOH

[NedKelly]

does it have a common name

[abolt]

Can KOH be bought over the counter ?

Yes

does it have a common name

Potassium Hydroxide