I don’t think Lowry “messed them up”. The DVDs and BDs almost certainly looked as George wanted them.
I’d be surprised if LF doesn’t have an actuate color reference in their archives.
IIRC one of the interview documents that came out specifies that they’re using at least two different references. I believe they have an answer print for each film and even a screening print to check against? I’m not 100% on that though