Question about priority

Got a PCT case with a foreign priority dated back in 2015. However along the years' amendments, the current case claims do not align with priority claims anymore, even though the priority specification still shows consistency of current spec. For this instance, how do you fill out bib, e.g. yes and no; yes and yes? Also, may prior art be later date than the priority application filing date because claims have been changed a lot? Thanks for helping probie here!