You could add each trace a loop.

fig = make_subplots(rows=1, cols=2)

for trace in p3().data:
    fig.add_trace(trace,
                  row=1, col=1
                  )

for trace in p2().data:
    fig.add_trace(trace,
                  row=1, col=2
                  )

fig.update_layout(height=600, width=800, title_text="Side By Side Subplots")
fig.show()