It is very similar, but it does work in a somewhat different way.
The side affects are also similar, (weight gain, edema, sex drive diminished, etc) but are different in individual cases. It is affected in relationship to GABA, but I don't think the mechanism is well known.
You'd have to 'google' it for a comparison and also
go to PubMed for write-ups.
It is stronger, less is used. The comparative ratio is 1 to 6, I believe
(300mgLyrica = 1800mg Neurontin)
It just works for me- when after 6+ yrs on Neurontin, I became
too tolerant and the Neurontin wasn't as effective any longer.
Switching to Lyrica helped, that's all I know.