Draws black cross on wall - to mark where to bang head.
If the vanilla PPL has extra endorsements it's not vanilla anymore. It's now a swirl.
If you buy yourself a sodding Cessna Caravan from the profits of owning your own aviation insurance company (that naturally covers your own aircraft) you still cannot fly the bloody thing on a VANILLA flavoured SEP PPL.
It has to have endorsements, nuts, swirl, ratings - whatever you want to add - but it has to have add ons....so it's not vanilla!!
What is so difficult about the original question...
Any person with a SEP valid can fly any SE airplane?
Can *ANY* person with an SEP fly *ANY* SEP aircraft.
No!!