Traceroute UDP port question

I know, that traceroute uses UDP, and for destination port it starts with 33434. Then, with each next hop it increments the destination port number by 1. The questions is: why does traceroute need to increment the destination port? Wouldn't it be sufficient to just increment the TTL value, while keeping the port number unchanged, say, 33434, or any other from the allowed range?

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