What is the difference, if the answers are the same?

This works, too- using it on an installation to send IR to a few pieces (using the dual emitters and connect to the IR port on two others, with the 2.5mm-3.5mm adapter.

[Link: youdoitelectronics.com]

When URC still had 2.5mm jacks, the first question at training sessions was an angry "When are you getting rid of those stupid jacks???????????" and the trainer would just roll his eyes, then talk about something else.