Re: Will the new C&S 4-4-0 look anything like this?

Lot of differences, other than having the same wheel arrangement and being built by the same manufacturer. This class you posted features the depressed frame underneath the firebox that Baldwin adopted for narrow gauge locomotives after about 1881 or so. You'll notice the frame doesn't run alongside the firebox on that machine like it does on 1870's-era designs like the "Eureka." If I recall, these machines were also a little larger than those that ran in Colorado. Fit and finish differed as well, as styling and fashion changed between ~1880 and ~1890. In particular the Colorado machines were delivered with beaded domes and peaked cab roofs, while the 1890's-era machines sent to Brazil were built new with rounded dome casings and a rounded cab roofline. Spark arrestors were likely different due to different types of fuel in use.

Of course the fuel differed as well. I enjoy watching Brazilian videos of wood-fired steam locomotives in operation....nearly all of them stuff large branches into the firebox, quite often as many as will fit. That's rather typical of practice that was common in-era, but isn't usually seen here up north anymore.