The FMQing shrink will depend on how much quilting there is.
Lots/heavy quilting? vs. minimal quilting?
The other shrinkage you should consider is the shrinkage after laundering.
Many a quilter has made a quilt the perfect size .... only to see it shrink up with laundering.
Both are going to affect the length and widths.
Sorry, but I can't give you any "rules" as to shrinkage.
Your LA'er may be able to give you a guideline.
The battings all give their shrinkage on the packaging.
Good Luck!