The noise levels are in general different, yes. I’ve tried to explain it here: http://help.chaosgroup.com/vray/help/300R1/migrate\_to\_3\_0.htm#bruteforce
But, on the one hand, in one case you are faced with a 1h render and no way to go lower, and in the other with a 13 minute render with only slightly more noise that you can clean up if you need. People specifically wanted faster glass renders, so I do faster glass renders…
Best regards,
Vlado