Actually they are very similar.
Both involve non-natural death, and both involve the medical profession in killing instead of healing, and both involve large government meddling and beaurocracies and funding. And both are beloved causes of leftists.
You’re purposefully omitting the fundamental difference between the two; the choice of the person to end their own life. Physician assisted suicide involves adults making adult decisions involving their own life, while abortion simply takes the life of a person without their consent.
Two completely different things.