No, the engineering drawings are prepared by the Engineer of Record (EOR) who is ordinarily retained by the client (the owner or his representative). Those drawings set out the specific requirements for the job, but in some cases, leave a bit of leeway for fabricator ingenuity to meet specified criteria.
Shop drawings are prepared by the fabricator or supplier and must meet the criteria set out by the EOR.
In the case of post-tensioned slabs and beams, the EOR might have specified a prestressing force per foot of width. Or he might have specified tendon sizes and locations and anchor types. In some cases, he might leave the entire design up to the supplier, subject to checking by the EOR.
What you should look for is anything which affects the capacity of the floor or roof to carry load because, in the end, the responsibility for the final design rests with the EOR.
BA