Spectra/PE/Dyneema is all the same material.
Sadly there are some places around the world producing material that isn't genuine or 100% Spectra, I had a friend who brought some off the net, took it on an expensive fishing holiday only to have it consistently fail when he put the pressure on big fish.
There has also been talk on some websites about some packs of Power Pro selling on the net that are not genuine US made, but who knows?
Best advice is to buy the best, either from the country that invented it Holland, or the two that are licensed to make it Japan and the USA.
Info.
Spectra does not rot, does not have a shelf life, and is impervious to the suns rays.
Use good connections and it retains almost 100% of its test/BS.