To Answer your question:
How many spacecraft deployed from the ISS have escaped Earth orbit?
Are there plans for any in the near future?
A short proof:
Public Sat-Catalog here
You can search by "International Designator = 1998-067" and filter "On-Orbit" you will get every known object released (intentionally or not) by the ISS an the ISS ...
Very short answer
They are different generations of the same family of interplanetary spacecrafts.
Zond 2, as well as Zond 1 and -3; and Venera 2 and -3, were interplanetary spacecrafts (in Soviet/Russian classification this category falls under "automated interplanetary station") of 3MV family 3MV English Wikipedia page (in Russian "3МВ" 3МВ ...