You need to set a border = const with value = 0 for a heat field. A heat border is imported from the dynamics with a value of -0.01. This can affect shading.
This is a simple python script to change file paths in selected Read and Write nodes. You can select part of the Nuke script, and if the selected nodes have a "file" knob, it will be changed:
SyncToy 2.1 is no longer available for download from the Mircosoft website. But it still works great on Windows 10 and is used in many cases of work automation. You can download the latest release of SyncToy 2.1 here.