Yes, You can use the charger, they are the same
But when charging my 3t phone it get heat( a little bit warm) will the charger is good or bad for it?
As @Cervantes mentioned, the OnePlus 6 charger can be safely used with any OnePlus device. With the OnePlus 3T, it will work as a regular Dash Charger.
Weekly Update 377 – Explore more with curiosity
by Eric X., 2021-03-05