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I know what you're getting at, but your comparison doesn't apply here. You're presumably comparing two different ISPs running two different technologies over two different networks to two different sets of customers. That would equate to comparing Vodafone 3G with O2 4G or vice versa.

To relate to 3G/4G you would have to compare graphs from the same ISP, running two different technologies, from the same exchange, over the same backhaul, to the same core network, to the same set of customers in the same location.

For example BT Infinity FTTP vs. BT Total Broadband, VM Big Red Internet vs. VM Cable/ADSL, etc. For fibre to have higher latency in either case would be extremely rare.