Michael,
Generally - rulings from other States are not binding on Queensland Courts (when we're referring to State-based legislation - which is what I assume you're referring to).
This is because a person might be found guilty of an offence under a section of a NSW Act - but there will not necessarily be a corresponding section under the Queensland legislation (and so a QLD judge might distinguish between your case and the NSW case on the basis that there are different elements to the offence, even if the facts are similar).
That said - the States do sometimes have very similar Acts (because some Acts were made having regard to a "model Act", for example). Where this is the case, the general rule is that the QLD Court will not be bound by a NSW Court ruling (as a precedent) but the NSW case is likely to be persuasive as to how the QLD judge approaches the matter - especially if it is a NSW Supreme Court or Court of Appeal ruling.
And so, whilst you might not be able to present the NSW case as your "trump card" as to how the judge must approach your case in QLD - it might help to mention it in your submissions, for example.
Someone on this forum can probably advise you further if you can let us know the relevant facts and NSW case that you're referring to. As Rod says - there are quite a few issues that would still need to be considered here before someone could give you a solid answer.
Best wishes.
