Some updates on the replacement sets. Even with two new sets to work from, I still had QC issues and could not make two complete sets (out of the four) - just two tiles short. The two new ones were in much better shape, both condition (blemishes, surface finish, rounded corners /edges from sanding), and size (LxW) consistency.
There are differences in the painting from the original resin lake.
L to R: Old lake, new river, new lake. Note the length issue between lake and river tiles over the four tile columns.
New lake, new river:
All new resin. Note size deltas:
Paint: old L, new R
New is sloppier, less uniform, and more crude, IMO. Can barely see the lighter green shallows, and colors (bubbles and edging) are not the same.