First things first: A big
to Dave for doing this video. I certainly believe your results. I guess the differences I see are accounted for by the bandwidth rating differences.
My RP3300 probes do not look like Dave's. Mine have an identical appearance to the RP2200 and have the compensation adjust on the probes and only have the BNC connector at the scope end, no box. I believe Dave's are now called RP3300A and mine are the old version.
nfmax: I measured with the probes connected and disconnected just now and the RP2200 always show a lower capacitance but as we know capacitance can change with frequency.
I also remembered as my head hit the pillow that both probes were connected at the same time for the image I posted so there is no difference in the loading on the signal between the two probes. This means the difference I see on the waveform in that image is solely due to the probes and not a loading issue.
In conclusion the differences I see are real, and due to the bandwidth differences of the probes.
I hope someone feels like doing a bandwidth test of common probes supplied with the lower end scopes. It would be interesting to see the real performance.
P.S. Oh yes, I will continue to use the RP3300 for single and dual channel use for obvious reasons.