In my most humble opinion, you would have a slight advantage over a new grad LPN with no healthcare experience. However, you must understand the differences between MA and nursing to understand what my fellow nurses who answered you previously were trying to say.
Yes, both take vital signs, assist physicians, take histories, obtain lab specimens, input data into medical records, change dressings, draw blood, get an EKG, and maybe a few other things I left out.
However, respectfully, in my most humble opinion, the main differences between MA and nurses is making assessments and taking intervening actions upon patient's changing condition. The expected environments are different, thus the curriculum are different. LPNs are expected to be able to work in LTC, even if it's not your desired environment, all LPNs are expected to be able to have the competencies to work in that environment. In a LTC environment the nurse determines if the patient is getting better or worse by interpreting the vital signs, lab results, wounds, level of consciousness, pupil dilation, and a host of other assessments. In an office environment, after the MA takes history and vital signs (and possibly room and patient prep), the patient is seen by the doctor. This is not to put down MAs at all. Both have very important functions, but different, do to the different environments each is expected to have competencies. A new grad LPN with an EMT-B background would have an advantage over an MA background simply because EMT-Bs, when at the scene of an accident, have to make assessments. EMT-Bs, like MAs, take vital signs, do dressings, take histories, etc; but, they also do assessments. In fact, both nurses and EMTs both learn the OPQRST assessment.
Will you have an advantage having an MA background? A little (or a lot if applying at a doctor's office in a specialty you've worked in). But any advantage is an advantage.
I was a Patient Care Tech in a hospital for a while - vital signs, EKGs, bladder scans, lab specimen gathering, assisted in body audit assessments, set up different equipment for different treatments, blood glucose tests, charted I&O, charted various observations, let the nurse know if something really wrong (I called several code blues), prepared patient and room in ED, assisted ED doctor, sterilized equipment in ED. My PCT background definitely helped when I became a LTC LPN, but not as much as I'd thought, but it did help. After LPN orientation, being placed on the floor, with the patient's lives in MY hands, being accountable, yeah ...