Yes, according to the reference, Pan in Dragon Ball GT is far stronger than Goten in Dragon Ball Super.
This is based on the relative power levels within their respective series. While Goten achieves Super Saiyan form in Dragon Ball Z and continues to train in Dragon Ball Super, Pan, by the time of Dragon Ball GT, has grown significantly and demonstrates remarkable potential.
The reference specifically highlights the massive difference in power levels within the GT universe, with Pan being among the stronger characters compared to Goten in the Super timeframe.