Two non-identical int64 numbers with 17 digits were compared, and the result obtained was the same.

[miscomputer]

func main() {
json1 := { "custom_id":72211083386779239 }
json2 := { "custom_id":72211083386779230 }

diff, _ := gojsondiff.New().Compare([]byte(json1), []byte(json2))

if diff.Modified() {
	fmt.Println(diff.Deltas())
} else {
	fmt.Println("Two JSONs are the same.")
}

}