I am getting ready to order some LS 901 atty's and found some at HappySmokes which say they are HS 901 LR, now I've been using the 901 LR on my 905 for quite a bit now, but these say they can't be used on the 905 as the 905 limits currant. I'm confused. Are the HS 901's a different atty from the regular 901's?