Ultra Blue 2 Different shades Help

[astra man]

Hey guys have a 03 ts astra with paint code z21b ultra blue went to get some paint today for my rear spoiler only to find there are two shades i was told a dark shade and a light shade i said my car is dark blue the paint shop said that doesnt mean its the darker tinted one can anyone help....

[Numbnut]

Welcome astra man.

http://www.opelaus.com/forums/showthread.php?32401-full-paint-code-colour-list&highlight=paint+codes

In the colour list there is only one Ultrablue with that exact code. It's the one you listed.
When you see random dark blue Astra's there seems to be 2 shades going around, sounds like the dude didn't know what he was talking about.
Best bet would be to order the paint.

[guy 27]

not uncommon for there to be a few shades of the same colour code.

you will have to just take a guess at which one it is unfortunately.