On Saturday, June 27, 2020 at 7:52:44 AM UTC-7, wrote:
Obviously this is a totally different aircraft. Can anyone explain this discrepancy?


The Viper picture is dated 2010, perhaps the number got recycled.

Where does one actually lookup the history for that registration?

I don't think so; OM-M9xx is the registration series used by Viper Aircraft. OM-M901 was displayed recently at an exposition:
https://www.tomarkaero.com/en/34-pre...ratislava.html

Tom