Meaning/Derivation of 32 byte TxID hash
How is a TxID assigned to a Transaction?


It's a hash of key transaction information -- inputs, outputs, scripts, signatures.


  Are 2 identical Txs that: double spend, have identical k PRNG-signed (so not a RNG!) sigs, identical inputs/outputs (a lot of assumptions here) given identical hashes?


This question is ill-formed. Unless there's some difference between them, they're not 2 transactions, they're one transaction. It's like talking about "two identical integers" -- that would just be one integer.