Not with TAT.AM shares, since they can't be redeemed for direct shares.
So they are actually worth even less than 95% of AM-PT.
However this is counterbalanced by the lower denomination, which allows you to buy some with spare change.
But that's what they are worth: spare change.
Anyone holding more than 99 fractional shares is just a fool IMAO.

Even the third-party risk is lower with AM-PT, since you already have to trust burnside anyway, being the owner of the trading platform.

(nothing personal against TaT, of course)