R help - Nov 2008 - different results with plot.glm vs. plot.glm(which=c(2))

I am running GLM models using the gamma family.  For example:
model <-glm(y ~ x, family=Gamma(link="identity"))

I am getting different results for the normal Q-Q plot and the
Scale-Location plot if I run the diagnostic plots without specifying the
plot vs. specifying the plot ... e.g., "plot(model)" gives me a
different
Normal Q-Q graph than "plot(model, which=c(2))" ... can anyone tell me
why
that would be?  Shouldn't they be the same?  I have read the
documentation on plot.lm and searched the help archives, but I am still
learning GLM's and I'm not very familiar with understanding diagnostic
plots
for GLM's, so any help would be much appreciated!

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