No, the new IQOS 3 DUO Pocket Charger is only compatible with IQOS 3.
If you insert the IQOS™ 2.4 Plus Holder into the IQOS 3DUO Pocket Charger, the Holder will not fit because of different size.
If you accidentally insert the IQOS 3 DUO Holder in the IQOS™ 2.4 Plus Pocket Charger, the Pocket Charger lights will start blinking, however, the Holder won’t charge.