If I have no side effects on topical Finasteride, does it mean I will have no side effects on oral?

I've currently been on topical finasteride 0.25% for 6 months. No side effects and thinking to switch slowly to oral as it is more efficient than topical finasteride. The fact that I have been on topical finasteride for 6months with no side effects does that mean that I am unlikely to have side effects from 0.25mg daily? (i.e does 0.25% have as much finasteride in the blood stream than 0.25mg? or what is the equivalent?) Would really appreciate your opinion on this? Many thanks!