It is common for standards to be referenced in a scope document, such as Works Information, which could lead to ambiguity if it is not clear how the standard actually applies to the works. For example it may relate to more than one possible option, so in this instance you would price the cheapest one and any change would be a CE.
As the Works Information states that the 'relevant standards will prevail' then it is suggesting that these areas take priority over what is stated in the WI. An 'ambiguity' could arise where what is actually required is a mix of both what is in the standards and what is in the WI. This is made a little more complicated by the inclusion of your bid qualification as part of the contract documentation.
There is no standard 'order of priority' within NEC contracts, although this is frequently added, usually within a 'Form of Agreement' document, which should be the first thing to consider.
Jon Broome wrote an excellent article on this subject which can be found here https://www.jonbroome.com/getattachment/44704d3b-547d-4bd9-a278-b40389ffcc58/Is-there-a-hierarchy-of-documents-under-the-ECC.aspx
It looks like you are responsible for design, so I would suggest clarifying this requirement at an early stage, by notifying the matter under clause 17 and considering whether any consequent PM instruction constitutes a CE.