MIT PGP - PGP UI - VIACRYPT mime

Cypherpunks,
   Question concerning MIT PGP 6.2 & PGP 6.2 ui. If it is known that
the PGP that encrypted a msg is one of these two versions, then can
it be determined which of these two versions did the encrypting?
Also, can it be determined that it was not VIACRYPT that did it.
Note: If it can be determined that PGP 6.2 ui did it, then it might
be a neat trick to change the ui version to mimic either of the
other two at user command.
                                                    Yours Truly,
                                                    Gary Jeffers

There is no PGP 6.2.  There is no MIT PGP 6.2.  There is no PGP 6.2 ui.

Assuming you mean PGP 2.6, there is no cryptographic difference between
any of these versions.

-derek