I'm not going to bother reading the links.

What makes the constructed different from the actual thing when both look and feel the same?

They are a fuck hole. That's all. No faux-gina is a vagina. it's a fuckable cavity carved into a pelvis. It has less in common with a vagina than a gunshot wound does.

First, a vagina doesn't just "secrete fluid". It secretes several specific and distinct types of fluids, arousal fluid is produced by special glands which males do not have called Bartholin's glands. It also continually produces moisture which maintains the health of the tissue, and is at a particular pH (which actually changes during the cycle). The vagina also, importantly, ends in a cervix which secretes its own fluids and they also change throughout the cycle. The vagina is made up of accordion like tissue and is surrounded by musculature which allows it to expand and contract under conscious and unconscious control. And then the whole thing is encircled by the clitoris, a structure which is only barely understood by medicine.

None of the constructed faux-ginas do or have any of these things. They are all simply holes, carved into a man, for the sake of his vanity and another man's penis. Faux-ginas do not maintain themselves. They must be forced open for hours a day, every single day, or they will close. No vagina does that.

And secondly, none of them, not even the best "look and feel" like the real thing. At all. Look up pictures of Phalloplasty. The pictures you can find online are the best results. The vagina, being mostly internal, is a little harder to see but it's no less ridiculous.