Why is boot looking different?

["Hans-J. Ullrich" <hans.ullrich@loop.de>]

Hi list, 

can someone explain, why the boot messages are looking different on one of my 
computers, although the package versions are on every host the same?

Nothing problematic, just want to know.
On the different one it looks like 

[ok] booting message bla bla

with a green "ok", and all others are looking like 

booting message bla bla 	    [ok] 

and a white "ok". As I said, nothing problematic, but I might want to know, 
WHY it is so, and how I can change the behaviour in case of.

Thanks for your help!

Hans