I will be flying SEA-DEN-DFW in the beginning of October on UA.
I had originally booked a flight from SEA which arrives in DEN at 2.42 pm and then a flight to DFW which departs at 4 pm.
That would give me roughly 1h 20min between flights.

However I just got a message that there has been a timetable change for my DEN-DFW flight.
The flight will now depart at 3.25 pm, giving me merely 45 mins in DEN.
Since I have never been to DEN and don’t know about the minimum connecting time, terminal layout, or current security measures, I wonder if the connection is feasible or if I should give UA a ring to change it?
I should add that I will have checked luggage as well (two suitcases that I cannot bring onboard).
Any comments would be appreciated!

Also a quick question about lounges, in case I have time to visit one in DEN (my SAS *G card will give me access).
There seems to be two RCC lounges in DEN, one in Terminal B East close to gate B44 and one in Terminal B West close to gate B32.
Is there any difference between these two lounges? Anyone better/nicer than the other?

Many thanks in advance!