Glad to see you made it through Signal Check.
One warning - Comparing power (W and kW) values is very tricky because each is a snapshot in time, which fluctuates quickly throughout the day as devices turn on an off. Sense gives you half second snapshots. Not sure what the interval SunPower invert and the app use for updates. The best thing to do is to look at the ENERGY (kWh) results for an entire day, once Sense has run for a full day.
As for comparisons based this one moment in time - I would guess that the solar number is more steady state than home usage. So the 3.8kW is comparable with the 4.1kW. I have seen Sense run about 3-6% lower than the inverter data, mainly because the inverter looks at total produced, not total delivered to your main panels (there are losses along the way).