LVN 1 is considered an entry level and LVN II is entry level management which is usually in charge of LVN 1 and they have more experience in the field.
This can vary a lot between hospitals. Where I work LVN I means just out of school with no experience. LVN II means 1-3 years experience. Check your institution for details.
In some states the only differece is the responsibility of drawing blood from patients. The term LNN is fastly becoming replaced by Medical Assistants.
LVN II is considered entry level (experience over 1 yr) management and LVN I is entry level (right out of school). Of course both levels have a different pay rate.