Hi @JimmyWork ,
Could you tell me:
Do you want to find the intersection between a collection and a SP list? (For example: If the value of a record in the collection is “xxx” and the value of the TicketID column in the list is also “xxx”, you need this record.)
If my assumption is correct, I've made a test for your reference:
1\ This is my list.

2\ This is my collection “TestCol”.
ClearCollect(TestCol,{Id:"ss",Value:"111"},{Id:"ssd",Value:"333"},{Id:"gg",Value:"555"},{Id:"sse",Value:"777"})

3\ Add a button control and set its onselect property to:
ClearCollect(HelloTest,ForAll(TestCol,LookUp(LIST49,TicketID=Value)))
4\ Add a gallery control and set its Items property to:
HelloTest
5\ The result is as follows:

Best Regards,
Wearsky
If my post helps, then please consider Accept it as the solution to help others. Thanks.