My left and right eyes are shifted +cyan and +magenta respectively, so, no, definitely not — but hooray for the resulting semi-tetrachromacy :D

For different brains, the answer has to be no because the images you see are a "neural net" construction and if that neural net differs then the "image" you see is different

this is actually a surprisingly rich area of debate in philosophy of mind. see: https://plato.stanford.edu/entries/qualia-inverted/

Consciousness and qualia are a mystery.

I would assume we don’t, simply because nerves are reproduced biologically, but I’m not a neuroscientist.

>the same g-protein coupled b

If my "g-protein" actually your "g-protein"? Is my visual cortex firmware your visual cortex firmware?

define "experience the same way"

There's a philosophical school of thought (which I share) that there's no coherent definition.