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It can work because the line rate is almost exactly the same for NTSC and CCIR (15734 and 15625Hz). It's the vertical frequency that is quite different (59.94 and 50.00Hz).
I've read that the CCIR standards were purposefully chosen such that Europe's TV manufacturing industry could use USA-made flybacks off-the-shelf (flybacks have a resonant frequency - using an American or Continental European flyback in a UK 405-line set could burn the flyback).
I have a digital tuner box (ATSC 1.0) that offers 576i PAL CVBS video out. Every US set I've tried it on has no problem with horizontal sync. Some sets can be adjusted for vertical sync (usually with vertical distortions), while others won't sync at all.
50Hz flowing through the yoke when there is a transformer near it with a 60Hz field can cause the picture to shimmy as though the picture were formed on the surface of wobbling jelly!
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