Public IP address

We rarely get answers to questions like this one. In my own case here in South Central PA, the first Comcast hop in traceroutes (Win 10 "tracert") is always 96.a.b.c, but my router reports an IP address and a default gateway in the 174.d.e.f range. I do not know why that is.

Better yet, traceroutes to the "first Comcast hop" and the gatway address IP look pretty much the same:

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tracert -4 comcast.net
Tracing route to comcast.net [69.252.80.75] over a maximum of 30 hops:
1 15 ms 6 ms 6 ms router1 [192.168.1.1]
2 21 ms 20 ms 16 ms 96.a.b.c      <-- first Comcast hop
^C

tracert -4 96.a.b.c               <-- first Comcast hop
Tracing route to 96.a.b.c over a maximum of 30 hops
1 22 ms 12 ms 12 ms router1 [192.168.1.1]
2 31 ms 20 ms 21 ms 96.a.b.c
Trace complete.

tracert -4 174.d.e.f              <-- router default gateway
Tracing route to c-174-d-e-f.hsd1.pa.comcast.net [174.d.e.f] over a maximum of 30 hops:
1 22 ms 12 ms 12 ms router1 [192.168.1.1]
2 33 ms 32 ms 22 ms c-174-d-e-f.hsd1.pa.comcast.net [174.d.e.f]
Trace complete.

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ETA:  I should note that some customers have reported that, for them, traceroute does report their gateway IP as the first Comcast hop. Why gateway IP = first hop IP for some but not for others, I do not know.