Others have mentioned that Seat Guru does not seem to get updated, and have advised looking to Aerolopa.

I agree that Aerolopa has better seat maps in terms of showing which (Polaris) seats are right next to the windows, and which are closer to the aisle. But, Seat Guru has "advice" that Aerolopa does not have. Such as, on one of the 763-300 series, the seats in 12 A, 15A, have very limited overhead storage due to emergency equipment stored overhead. Aerolopa does not warn about this. Seat Guru also discusses whether bulkhead seats have or don't have a foot cut out, and whether seats in front of a wing exit recline, etc.

So, for now, I check both websites! Be great if there was some way to synthesize the two websites, instead of having to check both. Any other suggestions are welcome!