Posted this under another thread that I started but did not receive any responses I guess as the title for the thread was a bit off.
Sorry for the double post.
So had some more Old Canadian stamps come in the mail:
The first picture is of two 6 cent queens.
The one on the left is the one I posted earlier in another thread and the one on the right is newly acquired. The colour looks red brown but I could do for some help. Is the one on the right larger? Or am I conjuring up images in my head. Is this a common phenomenon?

Now I also acquired some 1 cent Queen Vics. Again 3 out of these 4 seem physically larger than one of them. I am pretty sure they are all small queens and probably the smaller one has shrunk or something?
I am very new to stamp collecting and have little to no knowledge of the factors that can effect stamp size. Also, I am certain they should be Small Queens as the 1 Cent Large Queens are Reddish brown?

Thanks for your help.