So it’s quite likely that they will give the equivalent processor minus the “pro” features to the base model next year

Actually... that's unlikely.

This year's "Pro" processor is fabricated on TSMC's 3nm N3B process that has very low yield rates - Apple is apparently taking up 90% of the global production capacity for N3B fabrication even though they only use it with relatively low volume "Pro" chipsets.

They'll surely have better yields next year, but it would still be nowhere near enough to put them in the mainstream iPhone models. TSMC has said they have a new process (which will require new chip designs) online now, and that's what next year's mainstream iPhones will use. Manufacturing might have already started (for a late next year launch date).