Agree, as always, with WetAugust.
It doesn't matter how different LEA's dress it up, be it CRISP assessments, IPFs, IPAs, whatever, the fundamental fact is this:
A Statement of Special Educational Needs is a legal document which secures (if properly completed) specified and quantified provision for a child. NOT funding. Funding is irrelevant and immaterial to the child or their parents. It details the Special Educational Needs of the child, and what provision is required to meet those needs. Once a Statement is in place, a parent can appeal to the First Tier Tribunal (previously SENDIST) against either wording, provision, specifity or quanitification, school placement, whatever.
Any CRISP, IPF, IPAs, etc. are not legally binding, they do not secure provision and they do not guarantee funding.
You could have an 'agreement' that says your DS needs 15 hours per week of 1:1 support. Another child arrives with similar needs, and suddenly that funding has to stretch, so they reduce support. If the 15 hours was in an IPA, etc., you don't have a leg to stand on. If it was in a Statement, you'd be straight on to the LA, then First Tier Tribunal.
DO NOT be fobbed off.