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When comparing driving lines at the same track but from different days the GPS drift will make it hard to see what is going on since they can be placed a few meters differently.
I can make a script that adds or subtracts to lat and long to all data points in an exported log file. But... have you ever considered an offset function in RC for this? For example with arrow buttons moving the drive line step by step till it's more correct on the map?
Also, buying RC and getting all upgrades over the years seems unfair. Unfair to you. You should have a button in the app for a voluntary "upgrade fee" when releasing massively new things in the app 👍