difference between RMSHY-2 (big universal trap for hydrogen) and RMSH-2 (big universal trap for helium)?

What is the difference between RMSHY-2 (big universal trap for hydrogen) and RMSH-2 (big universal trap for helium)? Can I use helium trap for hydrogen gas? I have teo helium traps and wnat to use for helium and hydrigen gases

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