It's often very difficult to be able to ID seahorses, especially without knowing the source of them. While the pictures are not bad, I at least need closer side views to start searching but often even after comparing with the charts it may not be conclusive.
With the charts you need to compare tail rings, coronet profile, spines and other things to TRY to eliminate all but the one you have.
It IS easier if you know the source as some hobbyists are aware of what types are coming from various places.
If you want to download the file and save it to your computer you should be able to get the PDF file
HERE