To answer to your question, I am not sure about what makes if different between these frequencies. However, for the most Blu-ray DVD players, the frequency should be 60 MHz. I went through the manual, but can't find anything about the frequency as mentioned in your post.
As for the Samsung DVD Blu-ray player, the quality of picture in 3D comes out expectantly great as most players do. However, for some reason, this player can't detect automatically what sound system is used in most movies as the remote control does not have a feature to play 5.1 sound system (Dolby or DTS sound) rather than I have to go to its system setting to manually select it. Once I select it, other sound systems can't be available. That's pretty inconvenient and annoying!
US blu ray players are 60Hz. I don't know what's the difference between 50 or 60Hz as I use it here in Italy on a multisystem TV (Pal and Ntsc) and it works perfectly. Just remember that it is 110v, so if you use it with 220/240v you need a voltage converter. I bought one through Amazon that support till 75hz. Not too expensive