Agreed, I don’t think it translates as-is.
What I’ve seen done in shaders for game / real-time use is that whenever they’d need a random-like value, they’d pre-render a noise texture and plug that into the shader as the source of randomness.
You can use a Python script to generate a colorful noise texture to use as a base for random-like effects like these. Something like this (zoomed in 2x):
This way Blender and UE4 can both follow the same operations and it’ll be deterministic (same output).
You’ll need to do some minor modifications to those tile shaders above though, for them to work with a raster texture instead of the built-in brick or noise procedural textures.