x264 zones and VBV

[mp3dom]

I've encoded with x264 a movie which needs some scenes to be re-encoded at higher bitrate using zones. Since I'm using also a vbv-bufsize/maxrate of 30 mbps/40mbps (for BD), I'm asking if vbv took the precedence over zones. For example if the original scene is at 20 mbps and I put a bitrate multiplier of 2.5, do I risk to have a vbv overflow or x264 will limit the amount of used bitrate to adhere to VBV?
Also, since I've already made a 2 pass encoding, I'm guessing that I can re-do a second pass again specifying zones in the CLI using the 1st pass stats, right?
Thanks.

[Dark Shikari]

VBV is applied last. Zones won't stop it.

[mp3dom]

Good! Thank you.