Please note the following changes:

FRONT
Work as for Back until piece measures... from beg, end with a WS row —63 (69, 75, 83, 89, 95) sts.

NECK AND ARMHOLE SHAPING
Next row (RS) Work 23 (24, 24, 25, 25, 26) 31 (34, 37, 41, 44, 47) sts, join 2nd ball of yarn and bind off center st, work to end—31 (34, 37, 41, 44, 47) sts each side.
Working both sides at once, work 1 row even.

Rep dec row every 4th row 10 (11, 11, 11, 11, 12) times more AT SAME TIME when same piece measures 17 (17, 17½, 17½, 18, 18)in/43 (43, 44.5, 44.5, 45.5, 45.5)cm from beg, work armhole shaping same as for Back—12 (12, 12, 13, 13, 13) sts each side. Work even until same length as Back.

FINISHING
Armhole band
With RS facing, pick up and k 90 (96, 102, 106, 106, 112) 60 (64, 72, 80, 88, 96) sts evenly...