I am pretty sure Cadbury Creme ggs are smaller.
When I was a child, a friend of my grandmother's used to give my sister and I one of the packs of 3 creme eggs - I used to hate them, as I found them far too sweet and sickly, so my sister would end up with 6.
Now, I can occasionally eat them, if I'm in the right mood. I still miss the Galaxy Truffle eggs which used to be available but which they don't seem to make any more.
Here, you can now also get mini creme eggs which I like better then the full size ones as the sickly-sweetness is less overwhelming,both because the egg is much smaller and also because proportionally, there is less creme to chocolate.