Difference between the 2 insertion functions

Difference between the 2 insertion functions.go

package main

import (
	"fmt"
)

type Node struct {
	Data int
	Next *Node
}

func DisplayList(head *Node) {
	fmt.Printf("The list is: ")
	for ; head != nil; head = head.Next {
		fmt.Print(head.Data, " ")
	}
	fmt.Println()
}

// This modifies the head pointer in the calling function
func InsertAtEndInPlace(head **Node, x int) {
	fmt.Println("\nIn InsertAtEndInPlace:")
	tmp := Node{Next: nil, Data: x}
	fmt.Println("Inserting", tmp, "at the end")
	if *head == nil {
		*head = &tmp
	} else {
		var p *Node
		p = *head
		for ; p.Next != nil; p = p.Next {
		}
		p.Next = &tmp
	}
	fmt.Printf("Address of head node %p\n", &**head)
	fmt.Println("Address of head pointer ", &*head)
	fmt.Println("Returning")
}

// This returns the head
func InsertAtEnd(head *Node, x int) *Node {
	fmt.Println("\nIn InsertAtEnd:")
	tmp := Node{Next: nil, Data: x}
	fmt.Println("Inserting", tmp, "at the end")
	current := head
	if head == nil {
		head = &tmp
	} else {
		for ; current.Next != nil; current = current.Next {
		}
		current.Next = &tmp
	}
	fmt.Printf("Address of node %p\n", &*head)
	fmt.Println("Address of head pointer ", &head)
	fmt.Println("Returning")
	return head
}

func main() {
	var p *Node
	p = nil

	// Linked List Insertion
	InsertAtEndInPlace(&p, 2020)
	fmt.Printf("Adderss of node p %p\n", &*p)
	fmt.Println("Address of pointer p ", &p)
	DisplayList(p)

	p = InsertAtEnd(p, 1234)
	fmt.Printf("Adderss of node p %p\n", &*p)
	fmt.Println("Address of pointer p ", &p)
	DisplayList(p)
}