Well actually they started printing Rush albums in 1973 for the debut self titled LP release in 1974. If the US pressing is on the Anthem label, they are the same.
The first few came out on Mercury. When they started Anthem ( I believe after 2112 or Caress Of Steel, or maybe All The World's A Stage?), those early albums got reissued on Anthem. I prefer the original Mercury's of Fly By Night (MASTERDISK Gilbert Kong) and ATWAS. I think this would probably be the same for all the original Mercury's, but I don't own the others anymore.