The second Winnie statue is still on display in the Children’s area. It’s alongside one of the paths, between the hot air balloon and before the meerkat picture that you can stick your head through. It’s probably more prominent in this area, and seen by more people, as it has a book style sign next to it with the history of Winnie at the Zoo.
Regarding the Lions House sign - is it the long one you’re referring to? If so, it can still be seen in the Lion development, just quite hard to see. Really hard to explain, but it’s towards the back of the railway station enclosure, below the upper walkway, but I only saw it on a visit in the past couple of years and happened to be in the right place / level to spot it. As said, really hard to explain how to see it. I was surprised to see it, but also glad that it was still there.
And here are photos of Winnie in the new position - this photo is from 2020 so been there a while now.