The aborted fetus's are different. They have already been treated with such disrespect that I think doing more "tests" with them is going beyond disrespect.
Nonsense. They are useful material that would otherwise go to waste. They are no more special than a corpse from a car accident.
why is there no concern for embryo testing....?
Do you mean for gender, with female embryos being aborted? That can't be regulated by anybody but the doctors in reality. To try to regulate it using government intervention would affect testing for legitimate reasons and would be used as a wedge by the far right to limit access to abortion.
That's part of the problem with the anti-abortionists, they make it very difficult to address sub-issues.