If you ever need to identify the ratio of a Land Rover diff that’s out of the vehicle here’s are a couple of photos showing the difference. I’ve got two spare 3.54 diffs and one standard 4.7 series diff, I’ve sold one of the 3.54’s so had to get all three diffs side by side to identify which ratio was which as I had failed to label them. The pinion (circled in the middle photo) is clearly larger on the 3.54 diffs.