Re: Changing Non-Critical Component Suppliers - Convenience kits (FDA) Procedure pack
If the spec is that vague, you probably erred in accepting the PO without clarification.
Who called out the original (at time of PO) vendors?
If the customer, the vendor selections are an implied spec as well.
If the PO does not explicitly include in its definition of your directed actions the determination of vendors and the determination of whether alternate components are in fact "like-for-like", you are in the position of having to get the customer's approval for any vendor change or component substitution.
Contract review is all-important in avoiding questions like this.