I see the difference. Mine is transformer coupling without a choke, and yours is capacitor coupling with a choke. With what little research I’ve done, I think the difference is voltage mode vs current mode. At low powers I guess it doesn’t matter.
As long as it puts out RF! I’m on top of South Mountain in Phoenix right now trying to make a few contacts for the AM Rally with a cheap rice box. Not going too well...
Rice box modulation with a mobile antenna is almost hopeless. Anyway, it’s worth a try!
Jon