Yes, there is a psychological difference. Super wealthy have hard time trusting people including their family, friends, etc. Some of them even suffer from paranoia. Just a couple of bad experiences are enough for them to become like that. For ordinary mortals like us, we just write off our bad experiences with other people as natural, not some extraordinary. Being lied to, being backstabbed, lying, backstabbing, colluding, etc are all part of human existence: either one directly experience it or heard through others' experience. That is a cost to pay to live among people.
In other words, the experience of one whose wealth is $2B is not same as the experience of one whose wealthy is $50M plus $1.955B. What one experiences in the world depends on how much weight one puts on everything one is involved in. Poor people give different weightage than rich people. Same event doesn't give the same experience to everyone.
But you said: "One is super, super secretive, who passes off as a multi millionaire."
To say they "pass themselves off as" means there is a visible difference in either what they own or how they act. What does that look like? Are you saying they pretend to trust? How is that apparent? I can't figure out what the obvious visible difference would be.
If a millionaire passes themselves off as someone with much less wealth they'll drive an old Corolla instead of a Mercedes. What's that equivalent here?
In some actions, yes, he wants to appear as successful multi millionaires. In some other actions, he sounds like a billionaire. That's why he is seen as a weird multi-millionaire. He is not cheap either, but doesn't trust anyone: he feeds you information, to see whether you share that with other people; he says, he trusts you, later he can send a private detective to see what you are up to.
I think, the root cause is this: just as FAANG engineers's social circle is fellow people working from FAANG, it is the same for wealthy, super, uber wealthy. You don't see a FAANG guy living in a mobile home surrounded by people who work in the blue collar folks.
Some folks don't want to involve in many social activities of the class they belong to, but want to be part of the lower classes. That's what I mean by 'pass themselves off as'.
In other words, the experience of one whose wealth is $2B is not same as the experience of one whose wealthy is $50M plus $1.955B. What one experiences in the world depends on how much weight one puts on everything one is involved in. Poor people give different weightage than rich people. Same event doesn't give the same experience to everyone.