A bit of further digging for you on the ABS vs. non-ABS master cyl turned up some useful stock brake info on Dave Barton's 240 big front brakes conversion page over on his 240turbo.com site, ref. https://www.240turbo.com/volvo240bigbrakes.html
(I can see a bunch of you now spending the rest of the evening reading up on that conversion -be sure to check out related posts on TurboBricks)
It says the master cyl primary bore is the same (22.3 mm), but the secondary bore for the front brakes is larger for the ABS master cyl (19 mm vs 15.75 mm for non-ABS).
Oh, and one correction to my story, while 740 ABS front calipers use the single piston clam shell design, the 240 ABS front calipers stayed with a 4 piston design, both pairs of pistons on the same left front or right front brake line circuit from the ABS module.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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