Can I include new experiment results in a Camera Ready submission?
No, this would usually not be allowed. One important aspect has not been explicitly covered in Buffy's answer: bypassing peer-review.
Adding new experimental results can significantly alter the paper's contributions and conclusions, and adding them while submitting the camera-ready version bypasses the peer-review process. This is also the reason why many conferences that allow rebuttals to reviews do not allow adding new results even in the rebuttal. For example, the guidelines of CVPR 2021 state:

The author rebuttal is optional and is meant to provide you with an
opportunity to rebut factual errors or to supply additional
information requested by the reviewers. It is NOT intended to add new
contributions (theorems, algorithms, experiments) that were absent in
the original submission and NOT specifically requested by the
reviewers. You may optionally add a figure, graph or proof to your
rebuttal to better illustrate your answer to the reviewers' comments.