The Canadian pressing is the same as the 2nd US pressing. The 2nd press has a silver-grey cover with just Metal Massacre on the front, and the label is listed as Metalworks Records on the back, copyright owned by Metal Blade.
The labels are a silver and black simple typeset like the first press. The Ratt and Black and Blue songs are included and the Steeler song is omitted. “The New Heavy Metal Revue” was a fanzine operated by Brian Slagel, who founded Metal Blade Records.
This compilation represents Metallica’s first appearance on vinyl.
The New Heavy Metal Revue presents
Matrix / Runout (Side A): MW 6363A [CR stamp] ·D·
Matrix / Runout (Side B): MW 6363B [CR stamp] ·P·