majbauddin, I guess it is better to ask migration agent about your case. But if you are not sure that you can get this 5 points, you can wait for 60 days, while your invitation to apply expires. Since DIBP may give you a visa refusal as well as ban for 3 years to apply for messleading and incorrect information. However, if your occupations are closely related, based on tasks performed (I'm not specialists in your occupations), and you have supporting docs to prove it - than apply for 189.
Personnaly I worked as an accountant 2 years, than external audit 2 years and now budgeting - but assessment authority considers these occupations as relevant.