Sagemaker Neo

I have few questions for Sagemaker Neo:
(Apologies to create an Issue for this but I couldn't get answers on aws forum for the same)

1) Can I take advantage of Sagemaker Neo if I have an externally trained tensorflow/mxnet model?

2) Sagemaker provides container image for 'image-classification' and it has released a new image with name 'image-classification-neo' for the neo compilation job. What is the difference between both of them? Do I require a new Neo compatible image for each pre built sagemaker template(container) similarly?

Any help would be appreciated

Thanks!!