It is a lower loss line which could be down to length or cable gauge.
If noise levels are the same then yes, it could be better, however noise levels can vary between lines even when the follow the same route.
Now, look at the upstream figures: The first is 18.9Mbps on a 26.5 dB attenuation, and the second has a lower attenuation at 22.5 which should given a higher rate, but it does not, the speed being significantly lower at 14.9 Mbps If the Margin was similar, 5.8:6.2, then the figures could be a little closer but not significantly.
You will need to wait and see if the new line gets near to the older one.
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