Welcome to the forum
A quick way to understand how cold hardy a banana is probably going to be is to look at it's genotype.
'A' = acuminata
'B' = balbisiana
The balbisiana gene is more cold hardy than the acuminata.
Kokopo is an 'AA'
Dwarf Namwah is an 'ABB'
Here's a link to the USDA catalog
https://www.ars.usda.gov/southeast-a...usda-ars-tars/