No, that's not correct. The work you receive is always unique.
You can mine directly against bitcoind, or put a proxy in front of bitcoind (pool server) for better stats and management.
Hi does the proxy in this case a pool mining server provide better allocation of work to the gpus compared to bitcoind interms of probability of solving a block.
The probability of solving a block is the same for everybody, and you cannot change that. It's a function of being a cryptographic hash.
For an example, the work is divided into shares before sending to the GPU miners to hash, rather than the distributing the same entire workload to the number of GPUs available thereby creating a redundancy? (correct me if I am wrong as that is the perception I have now)
There is never any redundant work performed.