Yes the SSOCC coils are compatible I have used them in a bottom fill mini and a nano. The only difference is that in top fill you get about 1/2 ML more juice in the tank because of the smaller size of the round coil vs the square ones. You don't in the bottom fill because the air tube is shorter in it.
The coils work in all the Subtanks and toptanks including the subtank nano. The only thing that won't work in the Subtank nano is the RBA
Kanger SSOCC (Stainless Steel Organic Cotton Coil)
Listed as on Kanger site:
Kanger SSOCC (Stainless Steel Organic Cotton Coil) for
SUBTANK Series/TOPTANK Series/SUBVOD Series/Protank-4/NEBOX/K-KISS/K-PIN