If there is a decree signed by a judge then THAT is the court order that is legally binding. If the lawyer did not get the agreement signed and sealed by a judge, then it isn't worth the paper it was written on. If the decree was signed by the judge, but the lawyer did not get it recorded by the clerk or something, it is still the legal document. It all boils down to the judge's autograph.
Two bits of advice: One, if you and your x both like the current agreement, then you don't have to follow the official court order anyway. Also, if you plan to file to change the CO, then this may be a moot point soon. Don't make this any messier and hostile than it already is. Agreement is good; fighting is bad.
Second advice, and even more critical: NEVER trust your x's lawyer (or even your own lawyer) to go to court to attain a decree in your absence. If you are not there in court, things could get really ugly for you, not being there to defend yourself.
Remember, your x's lawyer's job is the promote his/her client's interests, which generally run contrary to yours.