[G1X Four] Beatles era Amp+Cab sims

I've been mulling over the amp and cab sims trying to find units that could have conceivably been used by the Beatles from their mid-career onward ('65-'70). My usual amp sim for playing around with is the Marshall 1959 but that's a pretty distinct sound that I don't believe the Beatles ever touched and also very late, not actually from '59. Its been difficult for me to date the included amp and cab sims to find something that matches the timeline I'm looking at. I think they used a Tweed Fender Deluxe https://www.tdpri.com/threads/history-of-the-beatles-amplifiers.1007415/ (so maybe the effect FD DLXR for an amp, with reverb turned down to its lowest) but I'm really stumped trying to find a cabinet, all the ones I can find a date for seem too young.

Amp sims I can understand pretty well but I'm not exactly sure how Cabinet sims affect output generally or specifically.
Any suggestions for approaching their sound? And how exactly do different cabinet sims affect sound?