The two amps would seem to have relatively little in common - other than their 500-watt power ratings and the 12AX7 tube in the preamp. One has a stripped-down, traditional tone stack EQ in the preamp, plus (I'm guessing) maybe a Class A or Class A/B power amp (Samson doesn't say). The other has all the bells and whistles on the front end, and a Class D, SMPS output section.
Kind of the proverbial apple and orange, aren't they?
MM