I haven't read the Redwall stuff in years, but based on my recollection I think you're right about that being Narnia with all Talking Animals and no magic. I hadn't thought about Reepicheep connecting to specific characters, but that's because I don't remember specific characters very well.

I'm not sure I see the Rowling/Tolkien thing as clearly, though. (For one thing, wizarding money isn't the same as pre-decimalization currency; it shares the trait of not dividing by tens, but Knuts and Sickles and Galleons don't actually map to pennies and shillings and pounds, much less the actual coinage. But I'll stop before I go off into random currency neepery, which would not be interesting to anybody, me included.)

Re: LotR movies, I'm in the camp of liking almost all of the changes Jackson made. But I was never a die-hard fan of the books, so I wasn't married to the original form of the story.