EFM Sheep Test CD and DVD

I did EFM Sheep Test on LG GSA 4167 (ver DL12)
sd2old -> ok
sd2.51-> ok
sd2.9 -> failed

I did a DVD complation with these files and I’m suprised:
sd2old -> ok
sd2.51-> ok
sd2.9 -> OK

Why everything can be copied from DVD+RW DISC ?
and some from CD-RW (both TDK) can’t ?

DVD uses a different encoding, not EFM (Eight to Fourteen Modulation), but if my memory serves, ESM (Eight to Sixteen).

Any EFM deficiency will not be repeated in DVD mode.