That’s an interesting find. Upon closer inspection, it seems like the binary .uff seems to store the parameters of some layers in an unsorted fashion, such as conv2d(strides=x, dtype=y, …) vs. conv2d(dtype=y, strides=x, …), causing differences in the checksum even though they’re logically equivalent.
If you output the human-readable/text (.pbtxt) version of the uff file however, it seems to sort the parameters to always get the same output. So as a workaround if your workflow is dependent on verifying the checksum of the model, you can try validating the checksum of the human-readable version instead:
# This will output both model.uff (binary) and model.pbtxt (human-readable)
convert-to-uff model.pb --text -o model