Yep, the architecture of the host needs to match ISO you are patching. This holds true for TKLPatch as well as the soon-to-be-released TKLDev.
It is technically possible to support patching/building 32bit on 64bit with some hacks, but not the other way around IIRC.
As for TKLPatch, it will continue to be maintained as it's useful for patching ISO's. But, for developing and building appliances, TKLDev will be the tool you'll want to use.
Yep, architecture matters...
Yep, the architecture of the host needs to match ISO you are patching. This holds true for TKLPatch as well as the soon-to-be-released TKLDev.
It is technically possible to support patching/building 32bit on 64bit with some hacks, but not the other way around IIRC.
As for TKLPatch, it will continue to be maintained as it's useful for patching ISO's. But, for developing and building appliances, TKLDev will be the tool you'll want to use.