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No telling. If you want to know what your FICO 4 is then you have to pull your FICO 4. You cannot use a score generated by one model to determine a score generated by a different model. Just because one FICO model increases doesn't necessarily mean that another will or to the same degree.
Fico 4 and Fico 8 scores are based on different models. As often as not, the scores do not move together.
If you want a true Fico 4 score you can purchase it through Equifax (make sure you choose the Score Power report) or through MyFICO.