There is only one category of marginal living entities know as the individual jiva-souls however, the individual jiva-souls can exist in "two different ways", both considered to be eternal, but only while the individual jiva-soul is in that position.

Both the spiritual world, which is 75% of the Spiritual Sky, and the material world, which is 25% of the Spiritual Sky, are eternal. 

1 - The individual jiva-souls can be nitya-baddha, which means being temporarily conditioned in the "active" material world, or "inactive" in the impersonal brahmajyoti.

2 - Or nitya-siddha which means being eternally liberated, if they choose, in the spiritual world's of the Vaikuntha planets and Goloka Vrindavana. 

Srila Prabhupada – "The answer to your question about the marginal energy is that the jiva-soul is always called the marginal energy whether he is in the spiritual world or in the material world." (Letter to Rayarama, Dec 2, 1968)

This point is emphasised here to make it clear only one kind of jiva-soul exists and due to having free will, can choose to be either nitya-siddha or nitya-baddha. 

The eternal individual jiva-souls can be either (by choice) nitya-siddha (liberated in the spiritual world if they choose which can be eternally) or nitya-baddha (conditioned in the material world, or impersonal brahmajyoti if they choose however, both these conditions are temporary)

Srila Prabhupada - "In the broader sense everyone comes from Krsnaloka. When one forgets Krsna he is conditioned (nitya-baddha), when one remembers Krsna he is liberated nitya-siddha." (Letter to Mukunda, June 10, 1969)

Srila Prabhupada - "There are two kinds of marginal living entities: nitya-siddha (un-conditioned in the spiritual world) and nitya-baddha (conditioned in the active material world, or inactive in the impersonal brahmajyoti). The actual constitutional position of every marginal living entity is nitya-siddha." (CC, lecture, July 13, 1976) 

Srila Prabhupada - "By following the rules and regulations and instructions of the spiritual master, he can become AGAIN nitya-siddha. So the Krsna consciousness movement is to make the nitya-baddhas AGAIN nitya-siddha." (New York City Temple Lecture CC, July 13, 1976)

Srila Prabhupada - "So the Krsna consciousness movement is to make the nitya-baddhas AGAIN nitya-siddha, to bring them to their original position. It is a difficult task." (London lecture BG, 13-14, July 14, 1973)**