In the battle of two very different sequels at the box office this weekend, Denzel Washington’s action pic “The Equalizer 2” has narrowly won out over the ABBA jukebox musical “Mamma Mia! Here We Go Again.” Studios on Sunday estimate that the R-rated Denzel Washington joint grossed $35.8 million from North American theaters over the weekend. It’s Washington’s first ever sequel and the biggest opening of director Antoine Fuqua’s career. The first “Equalizer,” from 2014, opened similarly and went on to earn over $190 million worldwide.