Saying you bought a look alike green pen and trying to say it is like the ones swimminsurfer is selling is basically saying you are comparing a life size painted wooden model of a Bugatti Veyron to the real thing.
Yes, they look extremely similar on the outside, identical if you would like,
but all of the difference is on the inside of the car.
The real car can actually move and run at around 253 mph for a top speed from a V-16. Versus the wooden model that can't move at all, let alone hit any top speed cause it has no engine (maybe if you push it
).
My point is there are a thousand and one different green pens available out in the world with different drivers, diodes, crystals, and then the quality of those part to go along with it. The pens that swimminsurfer sell are one of them and the single one you found and them comparing it to the 'super beast' is one of the other ones.
And comparing them (swimmingsurfers pens to the pen you have) is not logical or with reason.
Now, if you can prove somehow (not sure how though) that the pen you have is the same type of pen that swimminsurfer sells, however unlikely, then I will retract my rant and provide an adequate apology because I was wrong.