Ideally, this is an answer to a TLP post that asks "Do We Have This One?". Otherwise, it's answering a question that hasn't been asked, which looks pretty odd.
Using this message should be followed by a link to the trope page and an explanation of why they are the same to avoid misunderstanding and to allow informed discussion if there is disagreement with the assessment.
Please don't post only the trope name, as doing so can lead to confusion on the part of the reader.
If a TLP should come under scrutiny as being identical or too similar to a preexisting trope, any citation of the preexisting trope should be made only with the consideration of whether the examples in the TLP would actually be accepted in said trope. Neglecting this could result in the examples being removed by those who do not agree they meet the criteria.
Any further efforts should wait for a response from the TLP creator or custodian. If they don't respond within a reasonable period of time, then the other tropers on TLP can take the appropriate actions.