the hole in the roof is a very standard 14 inches square.
however the thickness of the roof and any "Middle" section for Ducting may and I stress MAY be different.. Some replacement units are designed so that does not matter..
One other thing.. Coleman's suck others blow
By that I mean Coleman units draw air in through the condenser (Suck) and blow it out the sides.. Others do it the other way around.. Why is this important?
To lean the condenser on a coleman remove 4 Phillips head bolts from top lift off cover peal built up "Crud" off the condenser replace cover and 4 bolts done
Others remove around a dozen screws an the cover then figure out how to open the inside cover over the condenser may or may not be easy how the fan is in the way of cleaning so you may need to remove it... See the difference.
