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Your attorney will have time to go over everything on the day of the deposition. If your attorney told you to not worry about it, you should feel good about that. Also, keep in mind that all parties involved realize that it has been 4 years, facts are always less clear after that amount of time, and this will be taken into account on the day of the deposition.
What you are saying is very common, and you should not be too concerned about apparent inconsistencies between recollections that happened 4 years ago, and those that are happening now.
What happened in the deposition is not your only chance to present your testimony. A copy of the deposition will presented to your attorney, who will ask you go go over it. You can make changes and explanations at time. Also, if this case goes to trial, you can explain things at that time.
In summary, as long as you can provide valid reasons for any discrepancies, they should be resolved in your favor.
Of course, it is up to your attorney, but it looks like that report should have more weight than anything that was said at the disposition! If the report favors you, the other side will probably try to keep it out of evidence, but you should be able to get it into evidence.
As far as I know, they would not be ordered to produce the form if, and only if, it is possible to get a copy elsewhere. If no other copy exists, or if it is not possible to get a copy elsewhere, the general rule is that the party with the copy or the original has to produce it.