IF you cut all the pieces the same size, and IF you sewed all the pieces together with the same seam allowance -
then the blocks should have ended up approximately the same size.
Not necessarily the expected size, but approximately the same size. :|
I am not a fan of trying to "stretch" a block when it is skimpy.
(I've read that even "experts" do it - I still won't do it)
What happens to it the next time it is washed and dried? I would think it would revert back to whatever was "natural" for it.
Like snug jeans - after wearing them for awhile, they stretch out - but they revert "back" after washing them again.