Andrew Gideon wrote:

The FBO where I typically fly has a 1977 182Q POH. I was looking for a 1980
182Q POH. Are these the same? That is, if the model "number" is the same,
is it the same product even if of a different year?

There are some notable differences between the various model years of the
C182Q, which would need to be reflected in the POH. Relative to the 1977
model, subsequent model years introduced the following substantial features:

1978 - 182Q
1. 28 volt electrical system.
2. Avionics master switch.

1979 - 182Q
1. Integral fuel tanks (wet wing) replaces fuel bladders,
usable fuel increased to 88 gallons (92 total capacity).

1980 - 182Q
1. New design audio panel and marker beacon.
2. Flap position control indicator redesigned.
3. Pull type alternator circuit breaker installed.
4. EGT optional.

[Source: Cessna Pilots Association C182 model history.]