These newer HTs seem to have a different pinout than the older Yaesu HTs. The older HTs used a single 3.5mm TRRS plug - these use a two-plug connector, with a 2.5mm jack and a 3.5mm jack, similar to the Kenwood/Baofeng style, but with the two plugs closer together.
What are the the different contacts on these two plugs, and how would you trigger PTT?